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Statement of a problem № 3669

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The quadrupole consists of four charges q, q, -q , -q located at the corners of a square on side a (Fig. 11.4). Show that at a point p, distant r from the centre of the charges and in the same plane, the electric field varies inversely as the fourth power of r , where r >> a.

Solution:
The quadrupole consists of four charges q, q, -q , -q located at the corners of

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