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Q.

The electric field in a certain region is acting radially outward is given by E=Ar. A charge contained in a sphere of radius ‘a’ centered at the origin of the field, will be given by

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a

A∈0a2

b

4π∈0Aa3

c

∈0Aa3

d

4π∈0Aa2

answer is B.

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Detailed Solution

ϕ=(Ar)4πr2, where r=aϕ=(Aa)4πa2qin ϵ0=A4πa3⇒qin =4π∈0a3A
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