1. There are two point charges on the x-axis. One is at the origin and has a cha

Question

1. There are two point charges on the x-axis. One is at the origin and has a charge of 4 coulombs. The other is at one meter and has a charge of 6 coulombs.

a) What is the electric potential at 0.2 meters?

b) What is the electric potential at 0.8 meters?

c) How much work is needed to move a charge of 10 coulombs from 0.2 meters to 0.8 meters?

2. There are three point charges on the x-axis. One is at the origin and has a charge of 4 coulombs. The second is at 0.2 meters and has a charge of 6 coulombs. The third is at 1 meter and has 10 coulombs of charge. What is the elctric potential energy of this arrangement?

Explanation / Answer

the electric potential at distance r is

V = k x (q/r)

where k = (1/4pi x e_o) = 9 x 10^9 Nm^2/C^2,q is charge and r is distance

the work done is

W = V x q1

where q1 is another charge

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