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A dipole of dipole moment $\vec{p}$ is kept along an electric field $\vec{E}$ such that $\vec{p}$ and $\vec{E}$ are in the same direction. Find the work done in rotating the dipole by an angle $\pi$. |
W = 2pE W = -2pE W = pE W = -pE |
W = 2pE |
$ W = \Delta U = U_2 - U_1 $ $U_2 = - E p cos\pi = Ep$ $ U_1 = -E p cos 0^o = - Ep$ $ W = 2Ep$ |
