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Three concentric spherical shells of rad...

Three concentric spherical shells of radius `a, 2a` and `4a` having positive charges `Q_(1), Q_(2)` and `Q_(3)` respectively are placed as shown. Now, shell of radius 'a' and '4a' are earthed through switch `S_(1)` and `S_(2)`. A point 'P' lies at a distance 5a from the centre and a point R inside the inner most shell. Now, choose the correct option (s) when switch `S_(1)` and `S_(2)` are closed.

A

The magnitude of electric field at 'P' and at 'R' is equal

B

The potential of inner most shell and outermost shell must be equal

C

The magnitude of charge on shell of radius 2a remains unchanged

D

Potential must drop in moving from inner most shell to middle shell

Text Solution

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The correct Answer is:
A, B, C
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