By Team Aakash Byju's | 22nd November 2022
Zero
−PE
PE
2PE
An electric dipole of dipole moment P is placed parallel to the uniform electric field of intensity E. On rotating it through 180, the amount of work done is
o
Detailed Explanation
The expression for the work done by an external agency to rotate a dipole is
W = PE(cosθ − cosθ ) where, θ is the initial angle θ is the final angle
1
2
1
2
In the given case, θ = 0° and θ = 180°. Thus, W = PE (cos 0° − cos 180°).
2
1
Since cos 0° = 1 and cos 180°= −1, we get W = PE (1 − (−1))
=> W = PE (2) or W = 2PE.