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Question

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An electric dipole consists of charges of magnitude 1.50 times 10-9 C separated by a distance of 6.20 times 10-6 m. The dipole sits in an electric field of magnitude 1100 N/C. (a) Determine the dipole moment magnitude. (b) In one orientation, the dipole moment is antiparallel (oppositely directed) to the electric field. In another orientation, the dipole moment is parallel to the electric field. Determine the difference between the electric potential energies for these two orientations.

Explanation / Answer

a) The magnitude of dipole moment is

p = qd = (1.50 * 10-9) * (6.20 * 10-6)

= 9.30 * 10-15 C.m

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b) U(180 deg) - U(0) = 2 p E

= 2 * (9.30 * 10-15) * (1100)

= 2.05 * 10-11 J

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