First slide

The bar magnet

Question

The magnetic moment of a bar magnet is 3.6x10^-3 A.m². Its pole strength is 120 milli amp. m. Its magnetic length is

Moderate

A

3cm
B

0.3cm
C

33.33cm
D

3x10^-2 cm

Solution

$2 l = \frac{M}{m}$

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