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An electric dipole moment p is placed in...

An electric dipole moment `p` is placed in an electric field of intensity `'E'`. The dipole acquires a position such that the axis of the dipole makes an angle `theta` with the direction of the field. Assuming that the potential energy of the dipole to be zero when `theta= 90^(@)`, the torque and the potential energy of the dipole will respectively be

A

`pE sin theta , -pE cos theta`

B

`pE sin theta , -2pE cos theta`

C

`pE sin theta , 2pE cos theta`

D

`pE cos theta , -pE cos theta`

Text Solution

Verified by Experts

The correct Answer is:
A
`vectau = vecp xxvecE implies |vectau| =pE sin theta`
`U = -vecp . vecE implies U =-pE cos theta`
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