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A short bar magnet produces a magnetic i...

A short bar magnet produces a magnetic induction of `4xx10^(-4)` tesla at an axial point, 20 cm away from its centre. What is the dipole moment of the magnet?

A

`M=8 Am^(2)`

B

`M=12 Am^(2)`

C

`M=16 Am^(2)`

D

`M=20 Am^(2)`

Text Solution

Verified by Experts

The correct Answer is:
C
`B_("axis")=mu_(0)/(4pi) (2M)/d^(3)`
`:. 4xx10^(-4) =10^(-7) xx(2M)/((2xx10^(-1))^(3))`
`:. 4xx10^(-4) =(Mxx10^(-4))/4`
`:. M=16 Am^(2)`
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