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Q.

Figure shows three concentric thin conducting spherical shells A, B and C of radii a, 2a and 4a respectively. Initially both the keys K1 and K2 are open see figure. Now charge Q is given to the shell B and key K1 is closed so that shell A is earthed without touching the shells B and C.

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Figure shows three concentric thin conducting spherical shells A, B and C of radii a, 2a and 4a respectively. Initially both the keys K1 and K2 are open see figure. Now charge Q is given to the shell B and key K1 is closed so that shell A is earthed without touching the shells B and C.