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There are three concentric thin spheres of radius `a,b,c (agtbgtc)`. The total surface charge densities on their surfaces are `sigma,-sigma,sigma` respectively. The magnitude of the electric field at `r` (distance from centre) such that `agtrgtb` is:

A

0

B

`(sigma)/(epsilon_(0)r^(2))(b^(2)-c^(2))`

C

`(sigma)/(epsilon_(0)r_(2))(a^(2)+ b^(2))`

D

none of these

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The correct Answer is:
b
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