An electric dipole of length 4 cm, when placed with its axis making an angle of 60° with a uniform electric field, experiences a torque of `4sqrt3`Nm. Calculate the potential energy of the dipole, if it has charge ±8 nC
Torque, τ=PEsinθ=(Ql)Esinθ ...(1)
Here, l is the length of the dipole, Q is the charge and E is the electric field.
Potential energy, U=−PEcosθ=−(Ql)Ecosθ ...(2)
Dividing (2) by (1):