Two opposite and equal charges 
when placed 
away, form a dipole. If this dipole is placed in an external electric field 
, the value of maximum torque and the work done in rotating it through 
will be
A
and 
B
Nm and 
C
and 
D
and 
Text Solution
Verified by ExpertsThe correct answer is:
D
Dipole moment p = 4 × × 10 –8 × × 2 × × 10 –4 = 8 × × 10 –12 m
Maximum torque = pE = 8 × × 10 –12 × × 4 × × 10 8
= 32 × × 10 –4 Nm
Work done in rotating through 180 o = 2pE
= 2 × × 32 × × 10 –4 = 64 × × 10 –4 J
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