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The intensity of magnetization of a bar ...

The intensity of magnetization of a bar magnet is `5.0 xx 10^(4) A m^(-1)` The magnetic length and the area of cross-section of the magnet are 12 cm and `1 cm^(2)` respectively. The magnitude of magnetic moment of this bar magnet is (in SI unit)

A

0.6

B

1.3

C

1.24

D

2.4

Text Solution

Verified by Experts

The correct Answer is:
A
Here, intensity of magnetisation,
`I = 5.0 xx 10^(4)Am^(-1)`
Magneetic length, `L = 12 cm = 12 xx 10^(-2)m`
Area of magnetisation,
`I = "Magnetic moment (M)"/"Volume (V)"`
or M = IV = IAL
`=(5.0 xx 10^(4)A m^(-1)) (1xx 10^(-4) m^(2))(12 xx 10^(-2)m)`
`= 60 xx 10^(-2)A m^(-2) = 0.6A m^(2)`
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