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Amagnet of magnetic moment 3 Am^(2) wegh...

Amagnet of magnetic moment 3 `Am^(2)` weghs 75 g The density of the material of the magnet is 7500 kg/`m^(3)` what is the intensity of mgnetisation ?

A

`2.5 xx10^(4)` A/m

B

`3 xx10^(5)` A/m

C

`2.5 xx10^(3) A/m`

D

`2.5 xx10^(2) A/m`

Text Solution

Verified by Experts

The correct Answer is:
B
Volume of the magnet
`V=("mass")/("density")=(75xx10^(-3))/(75xx10^(2))=10^(-5) m^(3)`
`therefore` intensity of magnetisation
? `I=(M)/(V )=(3)/(10^(-5))=3xx10^(5)` A/m
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