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Question

Three concentric conducting spherical shells A,B and C with charge Q (inside A), 2Q (outer face of B) and 3Q (outer face of C) and radius R,2R and 4R are placed as shown in figure. Energy stored between shell A and B is

  1. 0
  2. Q2πε0R
  3. Q22πε0R
  4. Q216πε0R


Solution

The correct option is A 0
Charge distribution is as shown in the figure. 




As there is no charge on the outer surface of A and inner surface of B. There is no electric field between them. Hence no energy is stored between these plates. 

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