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Torque on a Dipole

An electric d...

Question

An electric dipole is kept in a uniform electric field, it experiences

A

a force and a torque

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B

a force, but no torque

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C

a torque, but no force

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D

neither a force nor a torque

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Solution

The correct option is D a torque, but no force
For dipole placed in a uniform Electric field, net force, $F = + q E + (- q E) = 0$
Net torque about O, $τ = L q E s i n θ + L q E s i n θ$
$τ = q E (2 L) s i n θ$

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