1 Electrostatic Potential
The increase in electrostatic potential energy of a dipole of moment p when it is taken from parallel to anti-parallel orientation in an electric field E is
1) 2pE 2) 3pE 3) 4pE 4) 5pE
Solution:
p = dipole moment
U = - pEcos$$\theta$$
$$U_{1} =-pEcos0^{\circ}$$
$$U_{2} =-pEcos180^{\circ}$$
$$\Delta U =\left(U_{2}-U_{1}\right)=pE +pE=2 pE$$
Increase in potential energy $$\Delta U =2 pE$$
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