The effective length of the magnet is

The complete length of the magnet

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The distance between the two poles of the magnet

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The half of the length of the magnet

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The square of the length of the magnet

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Solution

The correct option is B The distance between the two poles of the magnet
The effective length of a magnet is defined as the distance between the magnetic north pole and the magnetic south pole of a bar magnet.
The grains in the bar magnet cannot form properly at the ends (not a continuous chain) and hence the geometic length is more than the magnetic length in the bar.

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