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A bar magnet has length 3 cm, cross-se...

A bar magnet has length 3 cm, cross-sectional area `2 cm^(3)` and magnetic moment `3 Am^(2)`. The intensity of magnetisation of bar magnet is

A

`2 xx 10^(5)A//m`

B

`3 xx 10^(5)A//m`

C

`4 xx 10^(5)A//m`

D

`5xx 10^(5)A//m`

Text Solution

Verified by Experts

The correct Answer is:
D
`L=3cm, =3 xx 10^(-2) m^(2)`,
`A=2cm^(2)=2xx10^(4)m^(2)`,
`M=3Am^(2)`
`M_(Z) to ` Intensity of magnetisation
`=(M)/(Lxx A)=(3Am^(2))/(3 xx 2xx106(-6) m^(3))`
`=1/2 A//m`
`=5xx10^(5) A//m`.
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Knowledge Check

  • A bar mangnet has length 3 cm cross sectional area 2 cm^(2) and magnetic moment 3 Am^(2) the intensity of magnetisation of the bar magnet is

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