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For a uniformly charged thin spherical shell of radius R and total charge Q, the electric field INSIDE the shell (r < R) is:
AkQ/r²
BZero — Gauss's law: enclosed charge is zero
CkQ/R²
DConstant kQ/R³
Answer & Solution
Correct answer: B. Zero — Gauss's law: enclosed charge is zero
Apply Gauss's law on a sphere of radius r < R inside the shell: **no charge enclosed → flux = 0 → E = 0**. **Outside the shell (r > R)**: shell behaves like a point charge at centre, E = kQ/r². **Just outside**: E = σ/ε₀ = kQ/R². NEET-favourite trap is testing inside-vs-outside.
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