Question

1. A battery holds the potential difference between two very large parallel plates fixed at 10...

1. A battery holds the potential difference between two very large parallel plates fixed at 10 Volts. If I slightly increase the separation between the plates, then the electric field between the plates _______.

A) decreases

B) increases

C) stays the same

D) not enough information

2. A particle has a charge of +1.28mC (microC) and moves from point A to point B, a distance of 0.191m. The particle experiences a constant electric force, and its motion is along the line of action of the force. The difference between the particle's electric potential energy at A and B is EPEA - EPEB = +8.90×10-4J. Calculate the magnitude of the electric force that acts on the particle.

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Answer #1

The battery potential remains constant. Hence the increase in separation between the plates will decrease the electric field between the plates. For the second problem, use the fact that work done by electric field is equal to negative of change in potential energy.

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