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A solid sphere of radius r has a charge ...

A solid sphere of radius r has a charge Q distributed in its volume with a charge density `rho = kr^a` where k and a are constants and r is the distance from its centre. If the electric field at ` r = R//2` is `1//8` times that at `r = R` , find the value of a.

A

2

B

3

C

`2.5`

D

`0.2`

Text Solution

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The correct Answer is:
A
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