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    Magnetism and Matter
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    Answer the following question regarding earth:
    In which direction would a compass free to move in the vertical plane point to, if located right on the geomagnetic north or south pole?
    A compass is free to move in a horizontal plane, while, the earth's field is exactly vertical at the magnetic poles. So the compass can point in any direction there.
    966 Views
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    Answer the following question regarding earth:
    The earth's field, it is claimed, roughly approximates the field due to a dipole of magnetic moment 8 x 1022 J T–1 located at its centre. Check the order of magnitude of this number in some way.
    Magnetic field B at an equatorial point of the earth's magnetic dipole is given by 

                          B = μ04π.mr3 
    Now,

    magnetic moment, m = 8 × 1022 JT-1 radius,  r = 6.4 × 106 m 

    Therefore,

                      B = 10-7×8×10226.4 × 1063T    = 0.3 × 10-4T   = 0.3 G 

    Which is of the same order of magnitude as that of the observed field on the earth.
    825 Views
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    Answer the following question regarding earth:
     If you made a map of magnetic field lines at Melbourne in Australia, would the lines seem to go into the ground or come out of the ground?
    Melborne in Australia is situated at the southern hemisphere of the globe where, north pole of the earth's magnetic field lies.
    Hence, magnetic field lines, due to the earth's magnetism would seem to come out of the ground.
    870 Views
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    Answer the following question regarding earth:
    The angle of dip at a location in southern India is about 18°. Would you expect a greater or smaller dip angle in Britain?
    Since Britain is closer to the magnetic north pole, we can expect a greater angle of dip in Britain.
    It's magnitude is about 70° in Britain.
    1007 Views
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    Answer the following question regarding earth:
    A vector needs three quantities for its specification. Name the three independent quantities conventionally used to specify the earth's magnetic field.

    The three independent quantities conventionally used to specify the earth's magnetic field are : 

    i) Magnetic declination
    ii) Angle of dip and,
    iii) Horizontal component of earth’s magnetic field.
    1519 Views
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