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Question

The electric field in a region is radially outward with magnitude E=αr. Calculate the charge contained in a sphere of radius R centered at the origin. Calculate the value of the charge if α=100Vm2 and R=0.30 m.

A
3×107C
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B
12×1010C
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C
3×1010C
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D
7×1010C
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Solution

The correct option is C 3×1010C

Consider a spherical shell of radius x. The electric flux through this surface is

ϕ=sEdS=Er4πr2

Therefore, the electric flux through spherical surface of radius R will be

ϕ=ER4πR2

When r=R,ER=αR, we have ϕ=αR4πR2By Gauss theorem, net electric flux is 1ε0×change enclosed

αR4πR2=1ε0Qenclosedor Qenclosed=(4πε0)αR3

Given R=0.30 m, α=100Vm2

Qenclosed=19×109×100×(0.30)3=3×1010C


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