Question

Derive an expression for torque acting on an electric dipole placed in uniform electric field

Answer 1

Explanation:

the direction of field is from -q to +q

torque=F×R perpendicular

F on -q=-qEsin(teta)

F on +q =+qEsin(teta)

we can maginitude of forces are equal

torque=qEsin(teta)×l

torque=q.l×Esin(teta)

we know p=q.d(where d is diastance)

torque=p×E sin(teta)