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(a) Name three elements required to spec...

(a) Name three elements required to specify the earth's magnetic field at a given place. Draw a labelled diagram to define these elements . Explain briefly how these elements are determined to find out the magnetic field at a given place on the surface of earth.
(b) A short bar magnet of magnetic moment m = `0.32 J T^(-1)` is placed in a uniform magnetic field of 0.15 T. If the bar is free to rotate in the plane of the field , which orientation would correspond to its (a) stable and (b) unstable equilibrium ? What is the potential energy of the magnet in each case ?

Text Solution

Verified by Experts

(b) (i) parallel , `-4.8xx10^(-2) J, `(ii) antiparallel, + 4.8 `xx 10^(-2) J`
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Knowledge Check

  • A short bar magnet of magnetic moment 0.4 J T^(-1) is placed in a uniform magnetic field of 0. 16 T. The magnet is in stable equilibrium when the potential energy is

    A
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    B
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    A
    `0.064 J`
    B
    `-0.064 J`
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    D
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  • A short bar magnet of magnetic moment 0.4JT^(-1) is placed ina uniform magnetic field of 0.16T. The magnet is in stable equibrium when the potential energy is

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