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Q.

The diagram shows A part of disc of radius R carrying uniformly distributed charge of density σ. Electric potential at the centre O of parent disc is

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a

σR2ε0

b

σR16ε0

c

σR24ε0

d

σR32ε0

answer is B.

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Detailed Solution

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dV=dq4πε0r=σrπ2.dr4πε0r  ∴V=σ8ε0∫R/2Rdr

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