The rst term on the right of 89 is the contribution

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Unformatted text preview: f the positive charges, therefore, will feel the force from the other positive charge (original Fc ), its own negative induced charge and the negative charge induced by the other positive charge. The latter effect corresponds to the effective attractive force in the direction parallel to the plane. The overall force in this direction is therefore decreased in comparison with Fc . One can think about this in different ways: For instance, that there is a partial screening of the original charge. It is especially clear for the case of a b, when a positive charge and its induced negative charge look very much like a dipole, and the field of the dipole is much weaker than the field of the original charge. 2 Double extra: The induced negative charge acts precisely as a mirror image charge. The total force in the direction paralle...
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