Two opposite and equal chrages `4 xx 10^(-8)` coulomb when placed `2 xx 10^(-2) cm` away, from a dipole. If dipole is placed in an ecternal electric field `4 xx 10^(8)` newton//coulomb, the value of maximum torque and the work done in rotating it through `180^(@)` will be

Options

A. `32 xx 10^(-4) Nm and 32 xx 10^(-4)J`
B. `64 xx 10^(-4)Nm and 64 xx 10^(-4)J`
C. `64 xx 10^(-4)Nm and 32 xx 10^(-4)J`
D. `32 xx 10^(-4) J and 64 xx 10^(-4)Nm`

Answer

D

Explanation

`tau = PE sin theta`