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Electric field Energy: Energy due to a dipole outside sphere

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Consider an imaginary sphere of radius a centered on a dipole of moment p. Show that the electric energy associated with the region of space outside the sphere is:

w= (p^2/12*pi*epsilon sub 0*a^3)

by integrating the energy density from r=a to r=infinity.

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Solution Summary

Energy stored outside a spherical region with a dipole of momenta P is at its centre.

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