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Exam 15: Electric Forces and Electric Fields

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Question 31

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In a thundercloud there may be an electric charge of +40 C near the top of the cloud and -40 C near the bottom of the cloud.These charges are separated by about 2.0 km.What is the electric force between these two sets of charges? (k_e = 8.99 * 10⁹ N·m²/C²)

A) 3.6 * 10⁴ N
B) 3.6 * 10⁵ N
C) 3.6 * 10⁶ N
D) 3.6 * 10⁷ N

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Question 32

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A spherical surface surrounds a point charge it its center.If the charge is doubled and if the radius of the surface is also doubled, what happens to the electric flux F_E out of the surface and the magnitude E of the electric field at the surface as a result of these doublings?

A) F_E and E do not change.
B) F_E increases and E remains the same.
C) F_E increases and E decreases.
D) F_E increases and E increases.

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Question 33

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Two charges, +Q and -Q, are located two meters apart and there is a point along the line that is equidistant from the two charges as indicated. Which vector best represents the direction of the electric field at that point?

The electric field of a point charge has an inverse ________ behavior.

Who was the first to determine the electron's charge?

Q₁ has 50 electric field lines radiating outward and Q₂ has 100 field lines converging inward.What is the ratio Q₁/Q₂?

An electron is sent at high speed toward a gold nucleus (charge +79e) .What is the electrical force acting on the electron when it is 3.0 * 10^-14 m away from the gold nucleus? (e = 1.6 * 10^-19 C, k_e = 8.99 * 10⁹ N·m²/C²)

A Van de Graaff generator has a spherical dome of radius 20 cm.Operating in dry air, where "atmospheric breakdown" is at E_max = 3.0 * 10⁶ N/C, what is the maximum charge that can be held on the dome? (k_e = 8.99 * 10⁹ N*m²/C²)

How can a charged object attract an uncharged object made of non-conducting material?

The beam of electrons that hits the screen of an oscilloscope is moved up and down by:

An electron with a speed of 2.0 * 10⁶ m/s moves into a uniform electric field of 500 N/C that is parallel to the electron's motion.How long does it take to bring the electron to rest? (m_e = 9.11 * 10^-31 kg, e = 1.6 * 10^-19 C)

An electron with a charge value of 1.6 * 10^-19 C is moving in the presence of an electric field of 400 N/C.What force does the electron experience?

Doug rubs a piece of fur on a hard rubber rod, giving the rod a negative charge.What happens?

An initially uncharged hollow metallic sphere with radius of 5 cm has a small object with a charge of +10 µC carefully placed at the center of the sphere through a hole in the latter's surface.With the charge in place, what charge is now present on the outside surface of the sphere?

If the size of the charge value is tripled for both of two point charges maintained at a constant separation, the mutual force between them will be changed by what factor?

If body M, with a positive charge, is used to charge body N by induction, what will be the nature of the charge left on the latter?

A proton initially moves left to right long the x axis at a speed of 2.00 * 10³ m/s.It moves into an electric field, which points in the negative x direction, and travels a distance of 0.200 m before coming to rest.If the proton's mass and charge are 1.67 * 10^-27 kg and 1.60 * 10^-19 C respectively, what is the magnitude of the electric field?

Two point charges, separated by 1.5 cm, have charge values of +2.0 and -4.0 µC, respectively.Suppose we determine that 10 field lines radiate out from the +2.0-µC charge.If so, what might be inferred about the -4.0-mC charge with respect to field lines?

Two electrons are separated by one cm. What is the ratio of the electric force to the gravitational force between them? (m_e = 9.11 * 10^-31 kg, k_e = 8.99 * 10⁹ N*m²/C², G = 6.67 * 10^-11 N*m²/kg², and e = 1.6 * 10^-19 C)

Object A has a charge q on it, object B has a charge q on it, and object C has a charge 2q on it.These charges are arranged, one each, at the vertices of an equilateral triangle.Which charge has the greatest magnitude electric force on it?