Question

A electric dipole of moment P is placed normal to the lines of force of electric intensity E, then the work done in deflecting it through an angle of 180
A. pE
B. +2pE
C. -2pE
D. Zero​

Answer 1

The correct option is D)Zero

Because the angle is 180°

And work done = pE sinα

and here α=180

therefore net work done will be Zero.

Hope it helps☺✌

Answer 2

Answer:

As we know that,

Work done=PĒ(cos∅1-cos∅2)

since,cos∅1=90°,

Cos∅2=180°

so,W=PĒ(cos90-cos180)

w=PĒ(0-(-1))

W=+PE

Explanation:

Hope it helps you.......