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The bar magnet produces magnetic inducti...

The bar magnet produces magnetic induction of `4xx10^(-5)T` at a point 10 cm from centre on the axis of magnet.The magnetic moment is

A

`0.2Am^(2)`

B

`0.002Am^(2)`

C

`2Am^(2)`

D

`0.02Am^(2)`

Text Solution

Verified by Experts

The correct Answer is:
A
`B=4xx10^(-5)T,r=10cm M=?`
`B=(mu_(0))/(4pi)(2M)/(r^(3))`
`4xx10^(-5)=(10^(-7)xx2xxM)/(10^(-3))`
`M=0.2Am^(2)`
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