Question

the ratio of magnetic length and geometrical length is

Answer 1

Explanation:

In the bar magnets the poles of the magnet are situated a little distance inside the ends of the magnet . The distance between these poles is known as magnetic length . The actual length or the size of the magnet is called geometric length . And therefore the magnetic length is obviously slightly lesser than the geometric length .

Magnetic length = (5/6)geometric length

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Answer 2

Note: The correct question must be provided with the following options-

In a bar magnet, the ratio of magnetic length to geometrical length is nearly

A) $0.74$

B) $0.80$

C) $0.84$

D) $0.94$

Explanation for correct option

C:

Magnetic length is slightly less than geometrical length in a bar magnet.

$Magnetic\ length =\frac{5}{6}\times geometric\ length$

$\frac{Magnetic\ length}{geometric\ length} =\frac{5}{6} \approx 0.84$

Thus, in a bar magnet , the ratio of magnetic length to that of its geometric length is nearly $0.84$.

Explanation for incorrect options

A,B,D:

Since, $\frac{5}{6}$ is not approximately equal to either $0.74, 0.80$ or $0.94$.

Thus, options a, b and d are incorrect.

Hence, option C is correct.

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