Indian Navy SSR (Sailor) Equipotential Surfaces — practice questions

Explore 2 free Equipotential Surfaces questions in Indian Navy SSR (Sailor) Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Equipotential Surfaces questions and exercises with answers

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Electric field due to an INFINITE SHEET of charge with surface charge density σ:Read the answer and worked solution →Two charged spheres each of radius R, charge Q, separated by distance d >> R. Force F between them is:Read the answer and worked solution →

Worked practice questions

Electric field due to an INFINITE SHEET of charge with surface charge density σ:

σ/ε₀
σ/(2ε₀)
kσ/r
σε₀

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Correct answer: B. σ/(2ε₀)

E = σ/(2ε₀) on each side of the sheet. Field is perpendicular to the sheet and uniform (independent of distance). For a conductor's surface, factor is σ/ε₀ (no 2).

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Two charged spheres each of radius R, charge Q, separated by distance d >> R. Force F between them is:

kQ²/R²
kQ²/d
kQ²/d²
kQR/d²

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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.