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  4. If L be the length of a bar magnet then separation between the two poles is nearly

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Q. If $L$ be the length of a bar magnet then separation between the two poles is nearly

Magnetism and Matter

Solution:

Geometric Length is always greater than magnetic length.
The magnetic Length approximately $0.83$ times to $0.85$ times of geometrical length.
So separation Between poles $=\frac{6}{7} L$.