Chapter 18 CYU 4/5

Gravitational potential energy is the potential for two masses to do work by virtue of their positions with respect to each other. What is the analogous definition of electric potential energy?

• Electric potential energy is the potential for two charges to do work by virtue of their positions with respect to the origin point.

• Electric potential energy is the potential for two charges to do work by virtue of their positions with respect to infinity.

• Electric potential energy is the potential for two charges to do work by virtue of their positions with respect to each other.

• Electric potential energy is the potential for single charges to do work by virtue of their positions with respect to their final positions.

A negative charge is 10 m from a positive charge. Where would you have to move the negative charge to increase the potential energy of the system?

• The negative charge should be moved closer to the positive charge.

• The negative charge should be moved farther away from the positive charge.

• The negative charge should be moved to infinity.

• The negative charge should be placed just next to the positive charge.

If the area of a parallel-plate capacitor doubles, how is the capacitance affected?

• The capacitance will remain same.

• The capacitance will double.

• The capacitance will increase four times.

• The capacitance will increase eight times.

If the area of a parallel-plate capacitor doubles, how is the capacitance affected?

• The capacitance will remain same.

• The capacitance will double.

• The capacitance will increase four times.

• The capacitance will increase eight times.

If you double the area of a parallel-plate capacitor and reduce the distance between the plates by a factor of four, how is the capacitance affected?

• It will increase by a factor of two.

• It will increase by a factor of four.

• It will increase by a factor of six.

• It will increase by a factor of eight.