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Using a compass needle low would you dis...

Using a compass needle low would you distinguish between three bars similar in shape and appearance if one is brass, the second is an unmagnetised iron and the third is a permanent magnet ?

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(i) Definition of magnetic meridian
(ii) Usually to determine the magnetic meridian we use a magnetic compass and the magnetic needle inside it is fixed in a horizontal plane.
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Suggest an activity to prepare a magnetic compass by using an iron needle and a bar magnet

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Three identical iron bars are kept on a table. Two out of three bars are magnets. In one of the magnet the North-South poles are marked. How will you find out which of the other two bars is a magnet? Identify the poles of this magnet.