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Question

A point charge q is placed inside a conducting spherical shell of inner radius 2R and outer radius 3R at a distance of R from the centre of the shell. The electric potential at the centre of shell will be 14πϵ0 times.


A

q2R

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B

4q3R

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C

5q6R

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D

2q3R

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Solution

The correct option is C

5q6R


Induced charges will be q and +q as shown in figure.


Potential at center will be V0=14πϵ0[qRq2R+q3R]

=14πϵ0(5q6R)


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