Question

A 100V battery connected to two oppositely charged plates that are 10cm apart.

a. What is the magnitude of the electric field?
b. What is the electric force exerted on a +200uC ?

Answer 1

Work to move unit charge from one plate to the other separated by d

W = E q d

Electric potential: V = W / q

E = V / d = 100 Volts / .1 m = 1000 Volts / m

F = E q = 1000 Joule / C m * 2 * 10E-4 C

F = .2 J / m = .2 N