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Questions  

A conducting sphere of radius R is charged to a potential of V volts. The electric field at a distance r(>R) from the center of the sphere would be   

a
Vr
b
R2Vr3
c
RVr2
d
rVR2

detailed solution

Correct option is C

V=q4πEoRq=V4πEoRE=q4πEor2                  r>R=V.4πEoR4πEor2=VRr2

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