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A and B are two concentric spherical she...

A and B are two concentric spherical shells made of conductor. Their radii are R and 2R respectively. The two shells have charge Q and – 2Q on them. An electron escapes from the surface of the inner shell A and moves towards a small hole in the outer shell B. (a) What shall be the minimum kinetic energy of the emitted electron so that it can escape to infinity through the small hole in outer shell? (b) What will be your answer if charge on both the shells were +Q? Charge on electron = e.

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