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A flat circular disc has a charge +Q uniformly distributed on the disc. A charge +q is thrown with kinetic energy E towards the disc along its normal axis. The charge q will:

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Return back along its path after touching the disc.

Any of the above three situations is possible depending on the magnitude of E.

Return back along its path without touching the disc.

Hit the disc at the centre.

answer is D.

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Detailed Solution

As there is strong repulsion between the two, the distance of approach between them depends on kinetic energy of the charge projected.

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