Ch 7

Three point charges are spaced equidistantly. All three charges have the same charge magnitude 𝑄, but two charges are positive and one is negative, as shown in the figure

• A, B, C, D

• B, A, C, D

• D, C, A, B

• B = C, A = B

The figure by James Clerk Maxwell shows the electric field lines and equipotentials of a pair of positive charges. Charge 𝐴 has four times the magnitude of charge 𝐵. Assume the electric potential is zero infinitely far from the charge configuration.

At which point would a negative charge have the greatest electric potential energy?

• 1

• 4

• 5

• 6

• 8

The figure by James Clerk Maxwell shows the electric field lines and equipotentials of a pair of positive charges. Charge 𝐴 has four times the magnitude of charge 𝐵. Assume the electric potential is zero infinitely far from the charge configuration.

If a positive charge has a velocity 𝑣⃗ at point 8, moving to which point would result in the greatest kinetic energy loss?

• 2

• 3

• 4

• 5

• 6

The figure by James Clerk Maxwell shows the electric field lines and equipotentials of a pair of positive charges. Charge 𝐴 has four times the magnitude of charge 𝐵. Assume the electric potential is zero infinitely far from the charge configuration.

A moving charged particle would experience no net change in kinetic energy when moving between which pairs of points? (Select one or more answers)

• 2 and 4

• 4 and 6

• 3 and 7

• 6 and 8

• 2 and 8

• 2.53 J

• -0.000198 J

• 0.000198 J

• -0.000152 J

• 0.000152 J

• 3.32 V

• 2.53 V

• -2.53 V

• -3.32 V

For a single, isolated point charge carrying a charge of 𝑞=4.67×10−11 C, one equipotential surface consists of a sphere of radius 𝑟₁=0.0189 m centered on the point charge, as shown in the figure.

What is the potential 𝑉₁ on this surface?

• 22.2 V

• 1176.6 V

• -22.2 V

• -1176.6 V

For a single, isolated point charge carrying a charge of 𝑞=4.67×10−11 C, one equipotential surface consists of a sphere of radius 𝑟₁=0.0189 m centered on the point charge, as shown in the figure.

Now, consider a second equipotential surface that is both farther from the charge and whose potential differs by Δ𝑉=8.02 V from first surface.

How far 𝑟₂ from the point charge should this second surface be?

• 0.0524m

• 0.0139m

• 0.0292m