Question

Two changes of +5uc and -2uc are placed at point (5cm ,0,0) and 2(23cm,0,0) in a region of space where there is no other external electric field.calculate potential energy of the charge system.​

Answer 1

Explanation:

Correct option is

B

−6×10

−4

J

Here the x-component of electric field is given only, i.e E

x

=250V/m

Thus, E

x

=−

dx

dV

or V=−∫

0

0.2

E

x

dx (as x varies from x=0 to x=20cm=0.2m)

or V=−250(0.2)=−50V

The change in potential energy =qV=12×10

−6

×(−50)=−6×10

−4

J