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Karnataka PUC II Science Magnetism and Matter — practice questions

Explore 28 free Magnetism and Matter 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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Magnetism and Matter questions and exercises with answers

Showing questions 1–28 of 28.

Magnetic field lines around a bar magnetRead the answer and worked solution →The torque on a magnetic dipole of moment m placed in uniform external field B isRead the answer and worked solution →The potential energy of a magnetic dipole in an external uniform 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 →Gauss's law for magnetism states that the net magnetic flux through ANY closed surface isRead 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 →A magnetic needle is in stable equilibrium when its magnetic moment m 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 →The pole strength of a magnet has SI unitRead the answer and worked solution →The work required to rotate a magnetic dipole of moment m in a field B from θ = 0 to θ = 180° isRead the answer and worked solution →Which of the following is INCORRECT about magnetic field lines?Read the answer and worked solution →The magnetic moment vector m of a bar magnet pointsRead the answer and worked solution →Order the steps for resistors in seriesRead the answer and worked solution →True or False: Current Electricity (ISC 12)Read the answer and worked solution →Match the Formula: Current Electricity (ISC 12)Read the answer and worked solution →Solve three resistance networksRead the answer and worked solution →Sort Kirchhoff's rules by their lawRead the answer and worked solution →Fuse equal resistors in parallelRead the answer and worked solution →Merge equal resistors in seriesRead the answer and worked solution →Current electricity bingoRead the answer and worked solution →Pick the right unit or ruleRead the answer and worked solution →Complete the current lawsRead the answer and worked solution →Current electricity: true or false?Read the answer and worked solution →Pick the bridge facts, fastRead the answer and worked solution →Complete the bridge storyRead the answer and worked solution →Knock out the bridge mythsRead the answer and worked solution →Flip and match the circuit toolsRead the answer and worked solution →

Worked practice questions

Magnetic field lines around a bar magnet

  1. Start from north and end at south pole, never closing on themselves
  2. Form continuous closed loops, passing through the body of the magnet
  3. Are straight lines parallel to the magnet's axis
  4. Intersect at the equatorial plane
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Correct answer: B. Form continuous closed loops, passing through the body of the magnet

Unlike electric field lines (open, from + to −), magnetic field lines always form CLOSED loops because magnetic monopoles do not exist.

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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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The potential energy of a magnetic dipole in an external uniform field B is

  1. U = −m · B
  2. U = +m · B
  3. U = m × B
  4. U = m / B
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Correct answer: A. U = −m · B

U = −m · B; minimum (−mB) when m is parallel to B, maximum (+mB) when antiparallel.

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More Physics topics

Current ElectricityElectric Charges and FieldsElectrostatic Potential CapacitanceElectromagnetic InductionElectromagnetismMoving Charges and Magnetism