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In a spherical distribution , the charge...

In a spherical distribution , the charge density varies as `rho(r)=A//r " for " a lt r lt b` (as shown) where A is constant . A point charge Q lies at the centre of the sphere at r = 0 . The electric filed in the region `altrltb` has a constant magnitude for

A

A = 0

B

A = Q

C

`A=(Q)/(2Pia^2)`

D

`A=(Q)/(4Pia^2)`

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The correct Answer is:
C
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