Question

Write formula for magnetic length

Answer 1

l=√ℏc/eB , all constants are in CGS units and B is in Tesla.

Constants in CGS-

ℏ=1.05457266∗10^−27 ergs s

c=3∗1010 cm/s

e=4.8032068∗10^−10 esu

and

1 Tesla (SI)= 1∗10^4 G (CGS)

Answer 2

Answer:

$L = (hc/eB)^{1/2}$

Explanation:

The length of the magnet is always measured between two poles.

In a bar magnet, the poles of the magnet are situated a bit inside the ends of the magnet, and this length in the magnet is known as the magnetic length. The actual length of the magnet is called the geometric length. The effective length of the magnet is always less than its geometric length.

The effective length of a magnet is the shortest distance between the top and bottom-most points of the column at the point of bending.

The length of a magnet is defined as the distance between one of the magnetic poles and the center of that magnet.

The effective length of the magnet is the distance between the magnetic north pole and the magnetic south pole in case of a bar magnet. The effective length is twice the length of the magnet.

Effective length= 2l

Actual length=L

Hence we can say the effective length of the magnet is the distance between the two poles of the magnet, and it is less than the geometric length of the magnet.

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