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Karnataka PUC II Science Electromagnetic Induction — practice questions

Explore 11 free Electromagnetic Induction questions in Karnataka PUC II Science 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 1–11 of 11.

Lenz's law is a direct consequence ofRead the answer and worked solution →Magnetic flux through a flat loop in a uniform field B isRead the answer and worked solution →The SI unit of magnetic flux is theRead the answer and worked solution →Self-inductance L of a coil is defined byRead the answer and worked solution →Motional emf induced in a straight conductor of length l moving with velocity v perpendicular to a uniform B isRead the answer and worked solution →Mutual inductance M between two coils is defined such that the emf induced in coil 2 due to changing current in coil 1 isRead the answer and worked solution →Eddy currents areRead the answer and worked solution →In a transformer, the ratio of secondary to primary voltage equalsRead the answer and worked solution →Self-inductance of a long solenoid of length l, cross-section A, with n turns per unit length isRead the answer and worked solution →Energy stored in an inductor carrying current I isRead the answer and worked solution →A horizontal conducting rod 0.5 m long moves at 10 m/s perpendicular to a 0.4 T magnetic field. The induced emf isRead the answer and worked solution →

Worked practice questions

Lenz's law is a direct consequence of

  1. Conservation of charge
  2. Conservation of momentum
  3. Conservation of energy
  4. Conservation of magnetic monopoles
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Correct answer: C. Conservation of energy

The induced current always opposes the change in flux because if it aided the change, it would create energy from nothing — violating energy conservation.

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Magnetic flux through a flat loop in a uniform field B is

  1. Φ_B = B · A cos θ, where θ is the angle between B and the area normal
  2. Φ_B = B · A sin θ
  3. Φ_B = B + A
  4. Φ_B = B / A
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Correct answer: A. Φ_B = B · A cos θ, where θ is the angle between B and the area normal

We have Φ_B = B · A. So Φ_B = BA cos θ. Maximum when normal is parallel to B (θ = 0), zero when perpendicular (θ = π/2).

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The SI unit of magnetic flux is the

  1. Ohm (Ω)
  2. Henry (H)
  3. Tesla (T)
  4. Weber (Wb)
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Correct answer: D. Weber (Wb)

1 Wb = 1 T · m². The tesla is the unit of B; the henry is the unit of inductance.

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