Filters
Question type
Study Flashcards

A charge q = 3 × 10-6 C of mass m = 2 × 10-6 kg, and speed v = 5 × 106 m/s enters a uniform magnetic field. The mass experiences an acceleration a = 3 × 104 m/s2. What is the minimum magnetic field that would produce such an acceleration?


A) 0.1 T
B) 0.004 T
C) 0.001 T
D) 0.01 T
E) 0.04 T

Correct Answer

verifed

verified

A fifteen turn rectangular loop of wire of width 10 cm and length 20 cm has a current of 2.5 A flowing through it. Two sides of the loop are oriented parallel to a uniform magnetic field of strength 0.037 T, the other two sides being perpendicular to the magnetic field. (a) The torque on the loop is (b) The magnetic moment of this coil is

Correct Answer

verifed

verified

(a) 0.028 ...

View Answer

A rectangular coil carrying a current in a magnetic field will experience a net torque that will cause the coil to rotate in that field, if the field is not along the coil axis.

Correct Answer

verifed

verified

If the south pole of one bar magnet is brought near the north pole of a second bar magnet, the two magnets will


A) attract.
B) repel.

Correct Answer

verifed

verified

A wire carrying a current that placed in a magnetic field will experience a maximum force if the angle between the direction of the current and the direction of the magnetic field is 60°.

Correct Answer

verifed

verified

A vertical wire carries a current straight up in a region where the magnetic field vector points due north. What is the direction of the resulting force on this current?


A) down
B) north
C) south
D) east
E) west

Correct Answer

verifed

verified

A wire carries a current of 11.4 A in a direction that makes an angle of 11.4° with a magnetic field of magnitude 11.4 × 10-3 T. The magnitude of the force on 11.4 cm of this wire is


A) 1.48 × 10-2 N.
B) 0.013 N.
C) 11.4 × 10-3 N.
D) 2.93 × 10-3 N.
E) 0.130 N.

Correct Answer

verifed

verified

An electron traveling due north with speed 4.0 × 105 m/s enters a region where the Earth's magnetic field has the magnitude 5.0 × 10-5 T and is directed downward at 45° below horizontal. What force acts on the electron?


A) 2.3 × 10-18 N
B) 3.2 × 10-18 N
C) 2.3 × 10-19 N
D) 3.2 × 10-19 N
E) 2.3 × 10-20 N

Correct Answer

verifed

verified

A current is flowing in a wire in direction 3 A current is flowing in a wire in direction 3 + 4 where the direction of the magnetic field is 5 + 12 . The force on the wire is A) 0.78 - 0.58 + 0.24 . B) 0.78 + 0.58 + 0.24 . C) 0.78 + 0.58 - 0.24 . D) . E) 0.71( + ) . + 4 A current is flowing in a wire in direction 3 + 4 where the direction of the magnetic field is 5 + 12 . The force on the wire is A) 0.78 - 0.58 + 0.24 . B) 0.78 + 0.58 + 0.24 . C) 0.78 + 0.58 - 0.24 . D) . E) 0.71( + ) . where the direction of the magnetic field is 5 A current is flowing in a wire in direction 3 + 4 where the direction of the magnetic field is 5 + 12 . The force on the wire is A) 0.78 - 0.58 + 0.24 . B) 0.78 + 0.58 + 0.24 . C) 0.78 + 0.58 - 0.24 . D) . E) 0.71( + ) . + 12 A current is flowing in a wire in direction 3 + 4 where the direction of the magnetic field is 5 + 12 . The force on the wire is A) 0.78 - 0.58 + 0.24 . B) 0.78 + 0.58 + 0.24 . C) 0.78 + 0.58 - 0.24 . D) . E) 0.71( + ) . . The force on the wire is


A) 0.78 A current is flowing in a wire in direction 3 + 4 where the direction of the magnetic field is 5 + 12 . The force on the wire is A) 0.78 - 0.58 + 0.24 . B) 0.78 + 0.58 + 0.24 . C) 0.78 + 0.58 - 0.24 . D) . E) 0.71( + ) . - 0.58
A current is flowing in a wire in direction 3 + 4 where the direction of the magnetic field is 5 + 12 . The force on the wire is A) 0.78 - 0.58 + 0.24 . B) 0.78 + 0.58 + 0.24 . C) 0.78 + 0.58 - 0.24 . D) . E) 0.71( + ) . + 0.24
A current is flowing in a wire in direction 3 + 4 where the direction of the magnetic field is 5 + 12 . The force on the wire is A) 0.78 - 0.58 + 0.24 . B) 0.78 + 0.58 + 0.24 . C) 0.78 + 0.58 - 0.24 . D) . E) 0.71( + ) . .
B) 0.78 A current is flowing in a wire in direction 3 + 4 where the direction of the magnetic field is 5 + 12 . The force on the wire is A) 0.78 - 0.58 + 0.24 . B) 0.78 + 0.58 + 0.24 . C) 0.78 + 0.58 - 0.24 . D) . E) 0.71( + ) . + 0.58
A current is flowing in a wire in direction 3 + 4 where the direction of the magnetic field is 5 + 12 . The force on the wire is A) 0.78 - 0.58 + 0.24 . B) 0.78 + 0.58 + 0.24 . C) 0.78 + 0.58 - 0.24 . D) . E) 0.71( + ) . + 0.24
A current is flowing in a wire in direction 3 + 4 where the direction of the magnetic field is 5 + 12 . The force on the wire is A) 0.78 - 0.58 + 0.24 . B) 0.78 + 0.58 + 0.24 . C) 0.78 + 0.58 - 0.24 . D) . E) 0.71( + ) . .
C) 0.78 A current is flowing in a wire in direction 3 + 4 where the direction of the magnetic field is 5 + 12 . The force on the wire is A) 0.78 - 0.58 + 0.24 . B) 0.78 + 0.58 + 0.24 . C) 0.78 + 0.58 - 0.24 . D) . E) 0.71( + ) . + 0.58
A current is flowing in a wire in direction 3 + 4 where the direction of the magnetic field is 5 + 12 . The force on the wire is A) 0.78 - 0.58 + 0.24 . B) 0.78 + 0.58 + 0.24 . C) 0.78 + 0.58 - 0.24 . D) . E) 0.71( + ) . - 0.24
A current is flowing in a wire in direction 3 + 4 where the direction of the magnetic field is 5 + 12 . The force on the wire is A) 0.78 - 0.58 + 0.24 . B) 0.78 + 0.58 + 0.24 . C) 0.78 + 0.58 - 0.24 . D) . E) 0.71( + ) . .
D) A current is flowing in a wire in direction 3 + 4 where the direction of the magnetic field is 5 + 12 . The force on the wire is A) 0.78 - 0.58 + 0.24 . B) 0.78 + 0.58 + 0.24 . C) 0.78 + 0.58 - 0.24 . D) . E) 0.71( + ) . .
E) 0.71( A current is flowing in a wire in direction 3 + 4 where the direction of the magnetic field is 5 + 12 . The force on the wire is A) 0.78 - 0.58 + 0.24 . B) 0.78 + 0.58 + 0.24 . C) 0.78 + 0.58 - 0.24 . D) . E) 0.71( + ) . +
A current is flowing in a wire in direction 3 + 4 where the direction of the magnetic field is 5 + 12 . The force on the wire is A) 0.78 - 0.58 + 0.24 . B) 0.78 + 0.58 + 0.24 . C) 0.78 + 0.58 - 0.24 . D) . E) 0.71( + ) . ) .

Correct Answer

verifed

verified

A wire of a certain length, carrying a current of 2.0 A, is placed perpendicular to a magnetic field of strength 0.20 T. If the wire experiences a force of 0.40 N what is the length of the wire?


A) 2.0 m
B) 3.0 m
C) 1.0 m
D) 20 m
E) 40 m

Correct Answer

verifed

verified

The force on a current-carrying wire in a magnetic field is the strongest when


A) the current is parallel to the field lines.
B) the current is at a 30° angle with respect to the field lines.
C) the current is at a 45° angle with respect to the field lines.
D) the current is at a 60° angle with respect to the field lines.
E) the current is perpendicular to the field lines.

Correct Answer

verifed

verified

FIGURE 27-7 FIGURE 27-7 -A Hall effect experiment is set-up with a conducting strip placed inside a magnetic field. A voltmeter is used to measure the voltage in the direction perpendicular to the direction of the current through the strip, as shown in Fig. 27-7. A current I runs in the positive y-direction, while the magnetic field is oriented in the positive z-direction. If the reading of the voltmeter is positive when the wires are connected to its terminals as shown below, what is the sign of the charge carriers in this strip? A) negative B) negative on the edges and positive in the middle of the strip C) could be either one D) positive on the edges and negative in the middle of the strip E) positive -A Hall effect experiment is set-up with a conducting strip placed inside a magnetic field. A voltmeter is used to measure the voltage in the direction perpendicular to the direction of the current through the strip, as shown in Fig. 27-7. A current I runs in the positive y-direction, while the magnetic field is oriented in the positive z-direction. If the reading of the voltmeter is positive when the wires are connected to its terminals as shown below, what is the sign of the charge carriers in this strip?


A) negative
B) negative on the edges and positive in the middle of the strip
C) could be either one
D) positive on the edges and negative in the middle of the strip
E) positive

Correct Answer

verifed

verified

A current carrying wire placed in a magnetic field perpendicular to the wire experiences a maximum force.

Correct Answer

verifed

verified

An electron, moving south, enters a magnetic field of certain strength. Because of this field the electron curves upward. What is the direction of the magnetic field?


A) downward
B) towards the east
C) upward
D) towards the west
E) towards the north

Correct Answer

verifed

verified

FIGURE 27-1 FIGURE 27-1 -When the switch is closed in the circuit shown in the sketch in Fig. 27-1, the wire between the poles of the horseshoe magnet deflects upward. From this you can conclude that the left end of the magnet is A) not contributing to the wire's deflection. B) a north magnetic pole. C) a south magnetic pole. D) a magnetic monopole. E) a magnetic dipole. -When the switch is closed in the circuit shown in the sketch in Fig. 27-1, the wire between the poles of the horseshoe magnet deflects upward. From this you can conclude that the left end of the magnet is


A) not contributing to the wire's deflection.
B) a north magnetic pole.
C) a south magnetic pole.
D) a magnetic monopole.
E) a magnetic dipole.

Correct Answer

verifed

verified

A wire of length L carrying a current I is placed in a magnetic field. The direction of the magnetic field is opposite the direction of the current. In this situation, the wire experiences a maximum force.

Correct Answer

verifed

verified

A proton, moving west, enters a magnetic field of a certain strength. Because of this magnetic field the proton curves upward. What is the direction of this magnetic field?


A) towards the west
B) towards the east
C) towards the south
D) towards the north
E) downward

Correct Answer

verifed

verified

Cutting a bar magnet near its north end results in a smaller mostly north pole magnet and a larger mostly south pole magnet.

Correct Answer

verifed

verified

FIGURE 27-5 FIGURE 27-5 -A rectangular coil, with corners labeled ABCD, of length L and width w is placed in a magnetic field B as shown in Fig. 27-5. If there is no current flowing through the coil, what is the force acting on section AB of the coil? A) ILB sinθ B) ILB cos θ C) ILB D) 0 N E) None of the other answers is correct. -A rectangular coil, with corners labeled ABCD, of length L and width w is placed in a magnetic field B as shown in Fig. 27-5. If there is no current flowing through the coil, what is the force acting on section AB of the coil?


A) ILB sinθ
B) ILB cos θ
C) ILB
D) 0 N
E) None of the other answers is correct.

Correct Answer

verifed

verified

What is the magnetic moment of a rectangular loop of 120 turns that carries 6.0 A if its dimensions are 4.0 cm × 8.0 cm?


A) 0.023 A∙m2
B) 0.23 A∙m2
C) 2.3 A∙m2
D) 23 A∙m2
E) 230 A∙m2

Correct Answer

verifed

verified

Showing 61 - 80 of 102

Related Exams

Exam 1

Introduction, Measurement, Estimating

71 Questions

Exam 2

Describing Motion: Kinematics in One Dimension

119 Questions

Exam 3

Kinematics in Two or Three Dimensions; Vectors

100 Questions

Exam 4

Dynamics: Newtons Laws of Motion

86 Questions

Exam 5

Using Newtons Laws: Friction, Circular Motion, Drag Forces

68 Questions

Exam 6

Gravitation and Newtons6 Synthesis

64 Questions

Exam 7

Work and Energy

69 Questions

Exam 8

Conservation of Energy

95 Questions

Exam 9

Linear Momentum

85 Questions

Exam 10

Rotational Motion

99 Questions

Exam 11

Angular Momentum; General Rotation

45 Questions

Exam 12

Static Equilibrium; Elasticity and Fracture

61 Questions

Exam 13

Fluids

112 Questions

Exam 14

Oscillations

102 Questions

Exam 15

Wave Motion

74 Questions

Exam 16

Sound

75 Questions

Exam 17

Temperature, Thermal Expansion, and the Ideal Gas Law

83 Questions

Exam 18

Kinetic Theory of Gases

37 Questions

Exam 19

Heat and the First Law of Thermodynamics

96 Questions

Exam 20

Second Law of Thermodynamics

77 Questions

Exam 21

Electric Charge and Electric Field

97 Questions

Exam 22

Gausss Law

44 Questions

Exam 23

Electric Potential

70 Questions

Exam 24

Capacitance, Dielectrics, Electric Energy Storage

73 Questions

Exam 25

Electric Currents and Resistance

71 Questions

Exam 26

Dc Circuits

110 Questions

Exam 28

Sources of Magnetic Field

63 Questions

Exam 29

Electromagnetic Induction and Faradays Law

116 Questions

Exam 30

Inductance, Electromagnetic Oscillations, and Ac Circuits

108 Questions

Exam 31

Maxwells Equations and Electromagnetic Waves

76 Questions

Exam 32

Light: Reflection and Refraction

118 Questions

Exam 33

Lenses and Optical Instruments

134 Questions

Exam 34

The Wave Nature of Light; Interference

77 Questions

Exam 35

Diffraction and Polarization

68 Questions

Exam 36

Special Theory of Relativity

69 Questions

Exam 37

Early Quantum Theory and Models of the Atom

95 Questions

Exam 38

Quantum Mechanics

42 Questions

Exam 39

Quantum Mechanics of Atoms

62 Questions

Exam 40

Molecules and Solids

56 Questions

Exam 41

Nuclear Physics and Radioactivity

82 Questions

Exam 42

Nuclear Energy: Efects and Uses of Radiation

69 Questions

Exam 43

Elementary Particle

66 Questions

Exam 44

Astrophysics and Cosmology

36 Questions

Show Answer