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Indian Navy Pilot Moving Charges and Magnetism — practice questions

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

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Moving Charges and Magnetism questions and exercises with answers

Showing questions 1–4 of 4.

Magnetic field at center of a circular loop of radius R carrying current I:Read the answer and worked solution →Torque on a current loop (moment m) in uniform field B:Read the answer and worked solution →Magnetic flux through a surface is:Read the answer and worked solution →Cyclotron frequency for a charged particle in magnetic field B:Read the answer and worked solution →

Worked practice questions

Magnetic field at center of a circular loop of radius R carrying current I:

  1. μ₀I / (2πR)
  2. μ₀I / (2R)
  3. μ₀I / (4πR)
  4. μ₀ I R
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Correct answer: B. μ₀I / (2R)

B = μ₀I / (2R) at center of circular loop. **For N turns:** B = μ₀NI / (2R). Direction along axis by right-hand rule.

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Torque on a current loop (moment m) in uniform field B:

  1. m + B
  2. m × B (magnitude m B sin theta)
  3. m B
  4. m / B
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Correct answer: B. m × B (magnitude m B sin theta)

τ = m × B. Magnitude τ = mB sin theta. Maximum when m is perpendicular to B zero when parallel/antiparallel. This is the basis of electric motors.

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Magnetic flux through a surface is:

  1. B × A only
  2. B · A (vector dot product, B × area projected)
  3. B + A
  4. B / A
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Correct answer: B. B · A (vector dot product, B × area projected)

Φ_B = ∫ B · dA = BA cos theta for uniform field, where theta is angle between B and surface normal. **SI unit:** weber (Wb) = T m².

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