JEE mains physics questions with solutions

Showing 1–2 of 2 questions

• MCQdifficultMagnetism and mattermagnet in magnetic field, torque, potential energy, oscillation and magnetic moment

  A magnetic dipole of moment M and moment of inertia I is initially at rest at an angular displacement 60° from its stable equilibrium position in a uniform magnetic field B.

  When it passes through the angular position 30°, its angular speed is:

  Options

  • Option A

    √[MB(√3-1)/I]

  • Option B

    √[MB(√3-1)/(2I)]

  • Option C

    √[2MB(√3-1)/I]

  • Option D

    √(MB/I)

  Check answerShow answer

  JEE mainsNeetMagnetism and Matter

  Open question & full solution →
• MCQmediumMagnetism and mattermagnet in magnetic field, torque, potential energy, oscillation and magnetic moment

  A thin bar magnet of magnetic length L and original magnetic moment M is uniformly bent into a circular arc that subtends an angle φ at the centre, where φ is measured in radians.

  Its new magnetic moment is:

  Options

  • Option A

    M·2sin(φ/2)/φ

  • Option B

    M·sinφ/φ

  • Option C

    M·φ/[2sin(φ/2)]

  • Option D

    M cos(φ/2)

  Check answerShow answer

  JEE mainsNeetMagnetism and Matter

  Open question & full solution →