An insulating solid sphere of radius R has a uniform volume charge density and total charge Q. Find the electric field at a point outside the sphere at a distance of r from its centre.
A
Q8πϵ0r2
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B
Q4πϵ0R2
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C
Q2πϵ0r2
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D
Q4πϵ0r2
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Solution
The correct option is DQ4πϵ0r2 For an outside point, sphere will act as a point charge, hence electric field will be given by