An electric dipole of dipole moment p is aligned parallel to a uniform electric field E . The energy required to rotate the dipole by 90^ is

Step-by-step solution

Given ₁=0^ , ₂=90^ The energy required to rotate the dipole from angle ₁ to ₂ is equal to work done. i.e., aligned E=W &=-p E ( ₂- ₁ ) &=-p E ( 90^ - 0^ ) &=-p E(0-1)=p E aligned