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A magnetic needle suspended freely in un...

A magnetic needle suspended freely in uniform magnetic field experience a torque but no net force. An iron nail near a bar magnet however experience a force of attraciton in addition to torque. Why?

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Knowledge Check

  • A magnetic needle is kept in a uniform magnetic field. It experiences:

    A
    a force and a torque
    B
    a force but not a torque
    C
    a torque but not a force
    D
    neither a torque nor a force

  • A magnetic field exerts no force on:

    A
    stream of electrons
    B
    stream proton
    C
    unmagnetised piece of iron
    D
    stationary charge.

  • A bar magnet is kept in a uniform magnetic field. It experiences :

    A
    a torque but not a force
    B
    a force but not a torque
    C
    both a force and a torque
    D
    neither a force nor a torque

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