Question

A solid sphere of radius R has a charge Q distributed in its volume with a charge density ρ = 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, the value of a is ______.

पर्याय

• 3

• 5

• 2

• 7

Answer 1

A solid sphere of radius R has a charge Q distributed in its volume with a charge density ρ = 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, the value of a is 2.