An electric dipole of dipole moment 
lying along uniform electric field 
. Calculate the work done in rotating the dipole by 
.
Text Solution
Verified by ExpertsThe correct answer is:
C
It is given that, electric dipole moment,
Electric field strength, 
When the electric dipole is placed in an electric field 
, a torque 
acts on it. This torque tries to rotate the dipole through an angle 
.
If the dipole is rotated from an angle 
to 
, then work done by external force is given by
…………… .. (i)
Putting 
in the eq. (i), we get
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