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Question: Three concentric spherical shells A, B and C having uniformly distributed total charges + Q, – 2Q an...

Three concentric spherical shells A, B and C having uniformly distributed total charges + Q, – 2Q and +Q respectively are placed as shown. The potential at the centre will be-

A

–Q4π∈0a\frac{–Q}{4\pi \in_{0}a}

B

–Q12π∈0a\frac{–Q}{12\pi \in_{0}a}

C

Q12π∈0a\frac{Q}{12\pi \in_{0}a}

D

Zero

Answer

Q12π∈0a\frac{Q}{12\pi \in_{0}a}

Explanation

Solution

Vcentre = + + KQ3a\frac { K Q } { 3 a } = KQ3a\frac { K Q } { 3 a }