Suggest a method to differentiate between a bar magnet and an identical iron rod without using any other supporting material .

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Solution

Dear student,

Break each bar in half. The two magnet halves will have strong forces between them which will change sign if you turn one piece 180°. The two iron halves won't have strong forces. A magnet half and an iron half will have fairly strong forces which will not change sign if you turn one by 180°. Unfortunately this is a somewhat destructive test.
Regards

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