Two charged spheres each of radius R, charge Q, separated by distance d >> R. Force F between them is:
AkQ²/R²
BkQ²/d
CkQ²/d²
DkQR/d²
Answer & Solution
Correct answer: C. kQ²/d²
For r >> R, sphere acts like a point charge at its center. F = kQ²/d² — the same Coulomb formula as point charges.
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