The electric field in a region is radially outward with magnitude E=Aγ0. The charge contained in a sphere of radiusγ0centered at the origin is
A
14πϵ0Aγ30
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B
4πϵ0Aγ30
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C
4πϵ0Aγ0
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D
14πϵ0Aγ30
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Solution
The correct option is B4πϵ0Aγ30 Flux linked with the given sphere ϕ=Qϵ0; where Q = Charge enclosed by the sphere. Hence Q=ϕϵ0=(EA)ϵ0 ⇒Q=4π(γ20)×Aγ0ϵ0=4πϵ0Aγ30.