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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’ centred at the origin of the field, will be given by

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a

4π∈0Aa2

b

A∈0a2

c

4π∈0Aa3

d

∈0Aa3

answer is B.

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Detailed Solution

ϕ=(Ar)(4πr2)

r=a

ϕ=(Aa)(4πa2)

qin∈0=A4πa3⇒qin=4π∈0a3A

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