Q.

A point charge Q is placed inside a conducting spherical shell of inner radius 3R and outer radius 5R at a distance R from the centre of the shell. The electric potential at the centre of the shell will be.

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a

14πε0.QR

b

14πε0.5Q6R

c

14πε0.13Q15R

d

14πε0.7Q9R

answer is C.

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Detailed Solution

Vnet=Q4πε01r-1a+1bVnet=Q4πε01R-13R+15RVnet=14πε013Q15R
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A point charge Q is placed inside a conducting spherical shell of inner radius 3R and outer radius 5R at a distance R from the centre of the shell. The electric potential at the centre of the shell will be.