Q.

A solid metal sphere of radius R having charge q is enclosed inside the concentric spherical metal shell of inner radius a and outer radius b as shown in figure. The approximate variation electric field as a function of distance r from centre O is given by

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a

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b

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c

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d

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answer is A.

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Detailed Solution

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The given situation is shown below

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The outer spherical shell as conducting. Now, charge will be induced on it.

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r<R, E=0Rr<a, E=kQr2ar<b, E=0rb, E=kQr2

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