Question 56

A solid sphere of radius R has a charge Q distributed in its volume with a charge densityy $$\rho = kr^a$$, where k and a are constants and r is the distance from its center. If the electric field at $$r = \frac{R}{2}$$ is $$\frac{1}{8}$$ times that at r = R, find the value of a,

Correct Answer: e

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