Question

What will happen to torque if electric field is not uniform?

Answer 1

If a dipole placed in non-uniform electric field, it will experience net force of attraction toward electric field of large magnitude that is, F(net)=p(E2-E1).

Torque is non zero when dipole is placed in uniform as well as non uniform electric field but in non-uniform electric field, dipole will experience net force of attraction whereas in uniform magnetic field, it doesn't.