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Question

A spherical volume has a uniformly distributed charge density 2×104Cm3. The electric field at a point inside the volume at a distance 4.0 cm from the centre is :

A
3.01×105NC1
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B
2.1×105NC1
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C
6.2×105NC1
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D
none of these
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Solution

The correct option is C 3.01×105NC1

Using Gauss's law the electric field inside the sphere , E.4πr2=Qenϵ0=ρ.(4/3)πr3ϵ0

E=ρr3ϵ0=2×104×4×1023×8.854×1012=3.01×105NC1


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