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Indian Navy Pilot Electromagnetic Induction — practice questions

Explore 4 free Electromagnetic Induction questions in Indian Navy Pilot Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Electromagnetic Induction questions and exercises with answers

Showing questions 1–4 of 4.

Faraday's law of electromagnetic induction states EMF induced equals:Read the answer and worked solution →RMS value of an AC voltage with peak V₀:Read the answer and worked solution →Energy density of magnetic field B in vacuum:Read the answer and worked solution →In an LR circuit with V = 12 V, R = 4 Ω, L = 2 H, current after t = 0.5 s:Read the answer and worked solution →

Worked practice questions

Faraday's law of electromagnetic induction states EMF induced equals:

  1. Current
  2. Rate of change of magnetic flux
  3. Magnetic flux
  4. Charge
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Correct answer: B. Rate of change of magnetic flux

EMF = -dΦ/dt. The induced EMF in a closed loop equals the negative time-rate of change of magnetic flux through the loop. Negative sign captures Lenz's law (direction).

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RMS value of an AC voltage with peak V₀:

  1. V₀ / 2
  2. V₀
  3. V₀ / sqrt(2) ≈ 0.707 V₀
  4. V₀ × sqrt(2)
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Correct answer: C. V₀ / sqrt(2) ≈ 0.707 V₀

V_rms = V₀/sqrt(2) for sinusoidal AC. For India's 230 V mains, peak is 230 × sqrt(2) ≈ 325 V.

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Energy density of magnetic field B in vacuum:

  1. B²/(2μ₀)
  2. B/(2μ₀)
  3. μ₀ B²
  4. B/μ₀
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Correct answer: A. B²/(2μ₀)

u_B = B²/(2μ₀). Analogous to u_E = (1/2)ε₀E². EM waves carry equal electric and magnetic energy densities.

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