2. Two thin coaxial uniformly charged rings with radii a and b (a > b) and charges q and -q, respectively, lie in a given plane. Find the potential at a large distance from this system.
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First, we need to find the electric field at a point P located at a large distance from the system. We can use Gauss's law to do this. Consider a cylindrical Gaussian surface of radius r > a and length L, with its axis passing through the center of the rings. The Show more…
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