Question

if l be the length of a bar magnet then separation between the two poles is nearly

Answer 1

Geometrical Length of bar magnet is L , then speration between two poles is nearly equal to 6/7 L .

Magnetic length : distance between two poles
Geometrical length of bar magnet : actual or original length of bar magnet.

Geometrical length is always greater than magnetic length. Magnetic length approximately 0.83 times to 0.85 times of Geometric length.

Hence, option (2) is correct.

Answer 2

Explanation:

Geometric length is equal to actual length of bar magnet and mangnetic length is seperation between 2 poles and is approx 0.83 of geometric length so ans is 6/7