Question

Deduce the expression for the torque acting on a dipole of dipole moment p in the presence of a uniform electric field E.​

Answer 1

Answer:

Explanation:

a) Dipole is a uniform electric field.

Let an electric dipole with charges -q and +q and of length 2a be placed in a uniform electric field at an angle θ.

Forces acting on the charges will be +qE and -qE. The net force will be equal and opposite. So force = 0.

Two forces are equivalent to torque having magnitude,

T = (qE)AC = qE.2a sinθ = pEsinθ