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Karnataka PUC II Magnetism and Matter — practice questions

Explore 6 free Magnetism and Matter questions in Karnataka PUC II Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Magnetism and Matter questions and exercises with answers

Showing questions 1–6 of 6.

The torque on a magnetic dipole of moment m placed in uniform external field B isRead the answer and worked solution →If a bar magnet is cut into two pieces transverse to its length, each pieceRead the answer and worked solution →The axial field of a short bar magnet of moment m at large distance r isRead the answer and worked solution →The equatorial field of a short bar magnet of moment m at large distance r isRead the answer and worked solution →The far-field of a bar magnet at distance r >> l is similar to that ofRead the answer and worked solution →Catch the wrong line on magnetsRead the answer and worked solution →

Worked practice questions

The torque on a magnetic dipole of moment m placed in uniform external field B is

  1. τ = m · B
  2. τ = m × B
  3. τ = m + B
  4. τ = m / B
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Correct answer: B. τ = m × B

τ = m × B; magnitude mB sinθ, perpendicular to both m and B. This is analogous to τ = p × E in electrostatics.

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If a bar magnet is cut into two pieces transverse to its length, each piece

  1. Is a complete magnet with both north and south poles
  2. Loses all its magnetism
  3. Has only a north pole
  4. Has only a south pole
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Correct answer: A. Is a complete magnet with both north and south poles

There are no magnetic monopoles — splitting yields two complete, smaller bar magnets. Same as cutting a solenoid.

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The axial field of a short bar magnet of moment m at large distance r is

  1. B_axial = (μ₀/4π) · (m / r²)
  2. B_axial = (μ₀/4π) · (2m / r²)
  3. B_axial = (μ₀/4π) · (2m / r³)
  4. B_axial = (μ₀/4π) · (m / r³)
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Correct answer: C. B_axial = (μ₀/4π) · (2m / r³)

Axial field: (μ₀/4π)·(2m/r³) — analogous to electric dipole axial field 2p/(4πε₀r³).

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