Question

# A solid sphere of radius R is charged uniformly. At what distance from its surface is the electrostatic potential half of the potential at the center?

A
R
B
R/2
C
R/3
D
2R
Solution
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#### Potential at the center of sphere is Vc=32kQRPotential at some distance x from center =KQxkQx=12(32kQR) or x=4R/3Distance from surface is x−R=R/3

3
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