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  4. For bar magnet effective length ( L e ) related with geometrical length ( L g ) as

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Q. For bar magnet effective length $\left( L _{ e }\right)$ related with geometrical length $\left( L _{ g }\right)$ as

Magnetism and Matter

Solution:

Correct answer is (b) $Le =\frac{5}{6} L _{ g }$