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An electron field of moment p is placed ...

An electron field of moment p is placed in a uniform electric field E. Then,
(i) the torque on the dipole is `pxx E`
(ii) the potential energy of the system is `p.E`
(iii) the resultant force on the dipole is zero.

A

(i), (ii) and (iii) are correct.

B

(i) and (iii) are correct and (ii) is wrong.

C

only (ii) is correct.

D

(i) and (ii) are correct and (iii) is wrong.

Text Solution

Verified by Experts

The correct Answer is:
B
In a uniform electric field `vecE`, dipole experiences a torque `vectau` given by `vectau = vecp xx vecE` but experiences no force. The potential energy of the dipole in a uniform electric field `vecE` is `U=-vecp.vecE`
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