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Outside a uniformly charged sphere the field magnitude at distance r from centre is equivalent to that of
Aa uniformly charged disc
Ban infinite line
Ca point charge at the centre
Dtwo equal charges
Answer & Solution
Correct answer: C. a point charge at the centre
1. Gauss' law gives E·4πr² = q/ε₀ for r > R, so E = q/(4πε₀r²).
2. This is identical to the field of a point charge q at the centre.
3. Hence outside the sphere it behaves like a point charge.
_Source: Maharashtra Balbharati Std XII Physics, Ch 8 "Electrostatics" §8.2.1_
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