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Indian Navy SSR (Sailor) Electromagnetism — practice questions

Explore 4 free Electromagnetism 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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Electromagnetism questions and exercises with answers

Showing questions 1–4 of 4.

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 →The magnetic force on a charge q moving with velocity v in field B:Read the answer and worked solution →For a current loop in a non-uniform magnetic field, net force is zero only if:Read the answer and worked solution →

Worked practice questions

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

  1. σ/ε₀
  2. σ/(2ε₀)
  3. kσ/r
  4. 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:

  1. kQ²/R²
  2. kQ²/d
  3. kQ²/d²
  4. 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.

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The magnetic force on a charge q moving with velocity v in field B:

  1. qE
  2. qvB sin theta
  3. q²B
  4. qB/v
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Correct answer: B. qvB sin theta

F = qv × B. Magnitude F = qvB sin theta where theta is angle between v and B. Direction perpendicular to both v and B.

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