Electrostatic Potential and Capacitance Ch 2

 Equipotential surfaces

1. What is an equipotential surface? Show that work is done in moving a test charge from one point to another over such surface.

         2. What is the shape of equipotential surfaces for a point charge?

 3. Draw an equipotential surface in a uniform electric field.

4. Two point charges + 10 µC and -10 µC are separated by a distance of 40 cm in air.

a. calculate  the  electrostatic potential energy of the system, assuming the zero of the potential energy to be at infinity

b. Draw an equipotential surface of the system. [ -2.25J, Perpendicular bisector]

Calculate the equivalent capacitance between points A and B in the circuit below. If a battery of 10 V is connected across A and B, calculate the charge drawn from the battery by the circuit. Answer: 10 µF, 10–4 C