Wednesday, October 20, 2010

Irodov Problem 3.58

Let the dipole comprise of two charges q and -q seperated by a distance d as shown in the figure. Thus,

As described in problem 3.54, using the method of images, the effect of having a dipole p at a distance l from the conducting plane is same has having another dipole -p at a distance 2l from the original dipole, as illustrated in the figure.

The force acting on the dipole is the sum of the forces acting on the two charges q and -q of the original (not the reflection) dipole due to the charges in the image dipole.

Thus we have,

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