An electric dipole with dipole moment 5 imes 10^{-6} C m is aligned with the direction of a uniform electric field of magnitude 4 imes 10^{5} N/C. The dipole is then rotated through an angle of 60

Question

An electric dipole with dipole moment 5 	imes 10^{-6} C m is aligned with the direction of a uniform electric field of magnitude 4 	imes 10^{5} N/C. The dipole is then rotated through an angle of 60^\circ with respect to the electric field. The change in the potential energy of the dipole is:

Vishal Gupta · Accepted Answer

B. U = -pE\cos	heta. \Delta U = -pE(\cos60^\circ - \cos0^\circ) = pE\left(1 - 	frac12ight) = 5	imes10^{-6} 	imes 4	imes10^{5} 	imes 0.5 = 1.0 J.

Electrostatic Potential and Capacitance

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