Question 1

An electron moves with a speed of 8.0 × 106 m/s along the +x-axis.It enters a region where there is a magnetic field of 2.5 T,directed at an angle of 60° to the +x-axis and lying in the xy-plane.Calculate the magnitude of the magnetic force on the electron.(e = 1.60 × 10-19C)

Accepted Answer

A)  2.8 × 10-10 N
B)  3.2 × 10-10 N
C)  2.8 × 10-12 N
D)  3.2 × 10-12 N

Question 2

A flat rectangular loop of wire carrying a 4.0-A current is placed in a uniform 0.60-T magnetic field.The magnitude of the torque exerted on this loop when the plane of the loop makes a 30° angle with the  B⃗\vec { B }B  field is measured to be 1.1 N ∙ m.What is the area of this loop?

Accepted Answer

A)  0.20 m2
B)  0.40 m2
C)  0.26 m2
D)  0.80 m2
E)  0.53 m2

Question 3

The magnitude of the  B⃗\vec { B }B  field that a long and extremely thin current-carrying wire produces at a distance of 3.0 µm from the center of the wire is 2.0 × 10-3 T.What is the current through the wire? (μ0 = 4π × 10-7 T ∙ m/A)

Accepted Answer

A)  30 mA
B)  190 mA
C)  19 mA
D)  380 mA  A

Question 4

Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions.The wires are separated by 20 cm.At what point between the two wires do they produce the same magnitude  B⃗\vec { B }B  field?

Accepted Answer

A)  4.0 cm from the 20 A wire
B)  8.0 cm from the 20 A wire
C)  12 cm from the 20 A wire
D)  16 cm from the 20 A wire
E)  18 cm from the 20 A wire

Question 5

At point P the  B⃗\vec { B }B  field due to a long straight wire carrying a current of 2.0 A is 1.2 µT.How far is P from the wire? (μ0 = 4π × 10-7 T ∙ m/A)

Accepted Answer

A)  11 cm
B)  22 cm
C)  33 cm
D)  44 cm
E)  55 cm

Question 6

An electron moving perpendicular to a uniform magnetic field of 3.2 × 10-2 T moves in a circle of radius 0.40 cm.How fast is this electron moving? (e = 1.60 × 10-19 C,melectron = 9.11 × 10-31kg)

Accepted Answer

A)  2.2 × 107 m/s
B)  1.9 × 107 m/s
C)  1.9 × 106 m/s
D)  3.0 × 107 m/s
E)  0.80 × 107 m/s

Question 7

A high power line carries a current of 1.0 kA.What is the magnitude of the  B⃗\vec { B }B  field this line produces at the ground,10 m away? (μ0 = 4π × 10-7 T ∙ m/A)

Accepted Answer

A)  4.7 µT
B)  6.4 µT
C)  20 µT
D)  56 µT

Question 8

A 2.0-m straight wire carrying a current of 0.60 A is oriented parallel to a uniform magnetic field of 0.50 T.What is the magnitude of the magnetic force exerted on it?

Accepted Answer

A)  zero
B)  0.15 N
C)  0.30 N
D)  0.60 N

Question 9

A long straight wire has a constant current through it to the right.A rectangular metal loop is situated above the wire,and also has a constant current through it,as shown in the figure.Which one of the following statements is true?

Accepted Answer

A)  The net magnetic force exerted on the rectangle is upward, and there is also a nonzero torque exerted on the rectangle.
B)  The net magnetic force exerted on the rectangle is zero, and the net torque on it is zero.
C)  The net magnetic force exerted on the rectangle is downward, and there is also a nonzero torque on the rectangle.
D)  The net magnetic force exerted on the rectangle is zero, but there is a nonzero torque on the rectangle.
E)  The net magnetic exerted force on the rectangle is downward, and the net torque on it is zero.

Question 10

An electron moves with a speed of 8.0 × 106 m/s along the +x-axis.It enters a region where there is a magnetic field of 2.5 T,directed at an angle of 60° to the +x-axis and lying in the xy-plane.Calculate the magnitude of the acceleration of the electron.(e = 1.60 × 10-19 C,me1 = 9.11 × 10-31 kg)

Accepted Answer

A)  1.3 × 1018 m/s2
B)  3.0 × 1018 m/s2
C)  1.3 × 10-18 m/s2
D)  3.0 × 10-18 m/s2
E)  0 m/s2

Question 11

A very long thin wire produces a  B⃗\vec { B }B  field of  0.0020×10−4 T0.0020 	imes 10 ^ { - 4 } \mathrm {~T}0.0020×10−4 T  at a distance of  1.0 mm1.0 \mathrm {~mm}1.0 mm  from the wire.What is the magnitude of the current? (μ0 = 4π × 10-7 T ∙ m/A)

Accepted Answer

A)  1.0 mA
B)  2.0 mA
C)  4000 mA
D)  3100 mA

Question 12

Alpha particles,each having a charge of +2e and a mass of 6.64 ×10-27 kg,are accelerated in a uniform  0.50 T0.50 \mathrm {~T}0.50 T   B⃗\vec { B }B  field to a final orbit radius of  0.50 m0.50 \mathrm {~m}0.50 m  The  B⃗\vec { B }B  field is perpendicular to the velocity of the particles.What is the kinetic energy of an alpha particle in the final orbit? (1 eV = 1.60 × 10-19 J,e = 1.60 × 10-19C)

Accepted Answer

A)  3.0 MeV
B)  2.6 MeV
C)  3.4 MeV
D)  3.9 MeV  A

Question 13

A long straight wire carrying a 4-A current is placed along the x-axis as shown in the figure.What is the magnitude of the  B⃗\vec { B }B  field at a point P,located at y = 2 cm,due to the current in this wire? (μ0 = 4π × 10-7 T ∙ m/A)  0 = 4π × 10-7 T ∙ m/A)    A) 20 μT B) 30 μT C) 40 μT D) 50 μT E) 60 μT " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  20 μT
B)  30 μT
C)  40 μT
D)  50 μT
E)  60 μT

Question 14

An electron moving perpendicular to a uniform magnetic field of 0.22 T moves in a circle with a speed of 1.5 × 107 m/s.What is the radius of the circle? (e = 1.60 × 10-19 C,melectron = 9.11 × 10-31kg)

Accepted Answer

A)  1.5 mm
B)  0.22 mm
C)  2.2 mm
D)  0.39 mm
E)  3.9 mm

Question 15

A flat circular loop carrying a current of 2.0 A is in a  B⃗\vec { B }B  field of 3.5 T.The loop has an area of 0.12 m2 and its plane is oriented at a 37° angle to the  B⃗\vec { B }B  field.What is the magnitude of the magnetic torque exerted on the loop?

Accepted Answer

A)  0.10 N ∙ m
B)  0.51 N ∙ m
C)  0.67 N ∙ m
D)  46 N ∙ m

Question 16

Three long parallel wires each carry 2.0-A currents in the same direction.The wires are oriented vertically,and they pass through three of the corners of a horizontal square of side 4.0 cm.What is the magnitude of the  B⃗\vec { B }B  field at the fourth (unoccupied) corner of the square due to these wires? (μ0 = 4π × 10-7 T ∙ m/A)

Accepted Answer

A)  1.2 µT
B)  2.1 µT
C)  12 µT
D)  21 µT
E)  0 T

Question 17

A straight 1.0-m long wire is carrying a current.The wire is placed perpendicular to a 0.20-T  B⃗\vec { B }B  field.If the magnetic force exerted on the wire has a magnitude of 0.60 N,what is the current in the wire?

Accepted Answer

A)  2.0 A
B)  1.0 A
C)  3.0 A
D)  4.0 A
E)  5.0 A  C

Question 18

A proton,with mass 1.67 × 10-27 kg and charge +1.6 × 10-19 C,is sent with velocity $2.3 \times 10^4 \mathrm {~m} / \mathrm { s }$ in the +x direction into a region where there is a uniform $\vec { E }$ field of magnitude $780 \mathrm {~V} / \mathrm { m }$ in the +y direction.What must be the magnitude and direction of the uniform $\vec { B }$ field in the region if the proton is to pass through undeflected? Assume that the magnetic field has no x component and neglect gravitational effects.

Accepted Answer

Question 19

An electron moving along the +x-axis enters a magnetic field.If the electron experiences a magnetic deflection in the -y direction,then the  B⃗\vec { B }B  field must have a component

Accepted Answer

A)  along the +z-axis
B)  along the -z-axis
C)  along the -x-axis
D)  along the +y-axis
E)  along the -y-axis

Question 20

An electron moving in the +y direction,at right angles to a magnetic field,the magnetic force exerted on it is in the -x direction.The direction of the  B⃗\vec { B }B  field is in the

Accepted Answer

A)  -x direction.
B)  +x direction.
C)  +y direction.
D)  -z direction.
E)  +z direction.

Exam 18: Magnetism

An electron moves with a speed of 8.0 × 10⁶ m/s along the +x-axis.It enters a region where there is a magnetic field of 2.5 T,directed at an angle of 60° to the +x-axis and lying in the xy-plane.Calculate the magnitude of the magnetic force on the electron.(e = 1.60 × 10^-19C)

Correct Answer
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A flat rectangular loop of wire carrying a 4.0-A current is placed in a uniform 0.60-T magnetic field.The magnitude of the torque exerted on this loop when the plane of the loop makes a 30° angle with the $\vec { B }$ field is measured to be 1.1 N ∙ m.What is the area of this loop?

Correct Answer
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The magnitude of the $\vec { B }$ field that a long and extremely thin current-carrying wire produces at a distance of 3.0 µm from the center of the wire is 2.0 × 10^-3 T.What is the current through the wire? (μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
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A

Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions.The wires are separated by 20 cm.At what point between the two wires do they produce the same magnitude $\vec { B }$ field?

Correct Answer
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At point P the $\vec { B }$ field due to a long straight wire carrying a current of 2.0 A is 1.2 µT.How far is P from the wire? (μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
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An electron moving perpendicular to a uniform magnetic field of 3.2 × 10^-2 T moves in a circle of radius 0.40 cm.How fast is this electron moving? (e = 1.60 × 10^-19 C,m_electron = 9.11 × 10^-31kg)

Correct Answer
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A high power line carries a current of 1.0 kA.What is the magnitude of the $\vec { B }$ field this line produces at the ground,10 m away? (μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
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A 2.0-m straight wire carrying a current of 0.60 A is oriented parallel to a uniform magnetic field of 0.50 T.What is the magnitude of the magnetic force exerted on it?

Correct Answer
verified

A long straight wire has a constant current through it to the right.A rectangular metal loop is situated above the wire,and also has a constant current through it,as shown in the figure.Which one of the following statements is true?

Correct Answer
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Correct Answer
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A very long thin wire produces a $\vec { B }$ field of $0.0020 \times 10 ^ { - 4 } \mathrm {~T}$ at a distance of $1.0 \mathrm {~mm}$ from the wire.What is the magnitude of the current? (μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
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Correct Answer
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A

Correct Answer
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An electron moving perpendicular to a uniform magnetic field of 0.22 T moves in a circle with a speed of 1.5 × 10⁷ m/s.What is the radius of the circle? (e = 1.60 × 10^-19 C,m_electron = 9.11 × 10^-31kg)

Correct Answer
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A flat circular loop carrying a current of 2.0 A is in a $\vec { B }$ field of 3.5 T.The loop has an area of 0.12 m² and its plane is oriented at a 37° angle to the $\vec { B }$ field.What is the magnitude of the magnetic torque exerted on the loop?

Correct Answer
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Correct Answer
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A straight 1.0-m long wire is carrying a current.The wire is placed perpendicular to a 0.20-T $\vec { B }$ field.If the magnetic force exerted on the wire has a magnitude of 0.60 N,what is the current in the wire?

Correct Answer
verified
C

Correct Answer
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An electron moving along the +x-axis enters a magnetic field.If the electron experiences a magnetic deflection in the -y direction,then the $\vec { B }$ field must have a component

Correct Answer
verified

An electron moving in the +y direction,at right angles to a magnetic field,the magnetic force exerted on it is in the -x direction.The direction of the $\vec { B }$ field is in the

Correct Answer
verified

Exam 18: Magnetism

An electron moves with a speed of 8.0 × 106 m/s along the +x-axis.It enters a region where there is a magnetic field of 2.5 T,directed at an angle of 60° to the +x-axis and lying in the xy-plane.Calculate the magnitude of the magnetic force on the electron.(e = 1.60 × 10-19C)

Correct AnswerverifiedShow Answer

A flat rectangular loop of wire carrying a 4.0-A current is placed in a uniform 0.60-T magnetic field.The magnitude of the torque exerted on this loop when the plane of the loop makes a 30° angle with the B⃗\vec { B }B field is measured to be 1.1 N ∙ m.What is the area of this loop?

Correct AnswerverifiedShow Answer

The magnitude of the B⃗\vec { B }B field that a long and extremely thin current-carrying wire produces at a distance of 3.0 µm from the center of the wire is 2.0 × 10-3 T.What is the current through the wire? (μ0 = 4π × 10-7 T ∙ m/A)

Correct AnswerverifiedA

Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions.The wires are separated by 20 cm.At what point between the two wires do they produce the same magnitude B⃗\vec { B }B field?

Correct AnswerverifiedShow Answer

At point P the B⃗\vec { B }B field due to a long straight wire carrying a current of 2.0 A is 1.2 µT.How far is P from the wire? (μ0 = 4π × 10-7 T ∙ m/A)

Correct AnswerverifiedShow Answer

An electron moving perpendicular to a uniform magnetic field of 3.2 × 10-2 T moves in a circle of radius 0.40 cm.How fast is this electron moving? (e = 1.60 × 10-19 C,melectron = 9.11 × 10-31kg)

Correct AnswerverifiedShow Answer

A high power line carries a current of 1.0 kA.What is the magnitude of the B⃗\vec { B }B field this line produces at the ground,10 m away? (μ0 = 4π × 10-7 T ∙ m/A)

Correct AnswerverifiedShow Answer

A 2.0-m straight wire carrying a current of 0.60 A is oriented parallel to a uniform magnetic field of 0.50 T.What is the magnitude of the magnetic force exerted on it?

Correct AnswerverifiedShow Answer

A long straight wire has a constant current through it to the right.A rectangular metal loop is situated above the wire,and also has a constant current through it,as shown in the figure.Which one of the following statements is true?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A very long thin wire produces a B⃗\vec { B }B field of 0.0020×10−4 T0.0020 \times 10 ^ { - 4 } \mathrm {~T}0.0020×10−4 T at a distance of 1.0 mm1.0 \mathrm {~mm}1.0 mm from the wire.What is the magnitude of the current? (μ0 = 4π × 10-7 T ∙ m/A)

Correct AnswerverifiedShow Answer

Correct AnswerverifiedA

A long straight wire carrying a 4-A current is placed along the x-axis as shown in the figure.What is the magnitude of the B⃗\vec { B }B field at a point P,located at y = 2 cm,due to the current in this wire? (μ0 = 4π × 10-7 T ∙ m/A)

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An electron moving perpendicular to a uniform magnetic field of 0.22 T moves in a circle with a speed of 1.5 × 107 m/s.What is the radius of the circle? (e = 1.60 × 10-19 C,melectron = 9.11 × 10-31kg)

Correct AnswerverifiedShow Answer

A flat circular loop carrying a current of 2.0 A is in a B⃗\vec { B }B field of 3.5 T.The loop has an area of 0.12 m2 and its plane is oriented at a 37° angle to the B⃗\vec { B }B field.What is the magnitude of the magnetic torque exerted on the loop?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A straight 1.0-m long wire is carrying a current.The wire is placed perpendicular to a 0.20-T B⃗\vec { B }B field.If the magnetic force exerted on the wire has a magnitude of 0.60 N,what is the current in the wire?

Correct AnswerverifiedC

Correct AnswerverifiedShow Answer

An electron moving along the +x-axis enters a magnetic field.If the electron experiences a magnetic deflection in the -y direction,then the B⃗\vec { B }B field must have a component

Correct AnswerverifiedShow Answer

An electron moving in the +y direction,at right angles to a magnetic field,the magnetic force exerted on it is in the -x direction.The direction of the B⃗\vec { B }B field is in the

Correct AnswerverifiedShow Answer

An electron moves with a speed of 8.0 × 10⁶ m/s along the +x-axis.It enters a region where there is a magnetic field of 2.5 T,directed at an angle of 60° to the +x-axis and lying in the xy-plane.Calculate the magnitude of the magnetic force on the electron.(e = 1.60 × 10^-19C)

Correct Answer
verified

A flat rectangular loop of wire carrying a 4.0-A current is placed in a uniform 0.60-T magnetic field.The magnitude of the torque exerted on this loop when the plane of the loop makes a 30° angle with the $\vec { B }$ field is measured to be 1.1 N ∙ m.What is the area of this loop?

Correct Answer
verified

The magnitude of the $\vec { B }$ field that a long and extremely thin current-carrying wire produces at a distance of 3.0 µm from the center of the wire is 2.0 × 10^-3 T.What is the current through the wire? (μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
verified
A

Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions.The wires are separated by 20 cm.At what point between the two wires do they produce the same magnitude $\vec { B }$ field?

Correct Answer
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At point P the $\vec { B }$ field due to a long straight wire carrying a current of 2.0 A is 1.2 µT.How far is P from the wire? (μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
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An electron moving perpendicular to a uniform magnetic field of 3.2 × 10^-2 T moves in a circle of radius 0.40 cm.How fast is this electron moving? (e = 1.60 × 10^-19 C,m_electron = 9.11 × 10^-31kg)

Correct Answer
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A high power line carries a current of 1.0 kA.What is the magnitude of the $\vec { B }$ field this line produces at the ground,10 m away? (μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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A very long thin wire produces a $\vec { B }$ field of $0.0020 \times 10 ^ { - 4 } \mathrm {~T}$ at a distance of $1.0 \mathrm {~mm}$ from the wire.What is the magnitude of the current? (μ₀ = 4π × 10^-7 T ∙ m/A)

Correct Answer
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Correct Answer
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A

Correct Answer
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An electron moving perpendicular to a uniform magnetic field of 0.22 T moves in a circle with a speed of 1.5 × 10⁷ m/s.What is the radius of the circle? (e = 1.60 × 10^-19 C,m_electron = 9.11 × 10^-31kg)

Correct Answer
verified

A flat circular loop carrying a current of 2.0 A is in a $\vec { B }$ field of 3.5 T.The loop has an area of 0.12 m² and its plane is oriented at a 37° angle to the $\vec { B }$ field.What is the magnitude of the magnetic torque exerted on the loop?

Correct Answer
verified

Correct Answer
verified

A straight 1.0-m long wire is carrying a current.The wire is placed perpendicular to a 0.20-T $\vec { B }$ field.If the magnetic force exerted on the wire has a magnitude of 0.60 N,what is the current in the wire?

Correct Answer
verified
C

Correct Answer
verified

An electron moving along the +x-axis enters a magnetic field.If the electron experiences a magnetic deflection in the -y direction,then the $\vec { B }$ field must have a component

Correct Answer
verified

An electron moving in the +y direction,at right angles to a magnetic field,the magnetic force exerted on it is in the -x direction.The direction of the $\vec { B }$ field is in the

Correct Answer
verified