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(B) The geometric length $(L)$ of a bar magnet is the actual physical length of the magnet.The magnetic length is the distance between the two magneti

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$\frac{6}{7} L$

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(B) The geometric length $(L)$ of a bar magnet is the actual physical length of the magnet.The magnetic length is the distance between the two magnetic poles of the magnet.It is an experimental fact that the magnetic poles are located slightly inside the ends of the magnet.The magnetic length is approximately $0.83$ to $0.85$ times the geometric length.Calculating the value of $\frac{6}{7} \approx 0.857$,which is the closest approximation to the ratio of magnetic length to geometric length.Therefore,the separation between the poles is nearly $\frac{6}{7} L$.

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

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