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A bar magnet has grometrical legth 4.8 c...

A bar magnet has grometrical legth 4.8 cm.The magnetic moment of bar,of pole stregth 20 Am is

A

`0.8 Am^(2)`

B

`0.6 Am^(2)`

C

`0.4 Am^(2)`

D

`1.0 Am^(2)`

Text Solution

Verified by Experts

The correct Answer is:
A
`2l=(5)/(6)xx"geometric length"=(5)/(6)xx4.8=4cm`
` M=2l. M=15xx10^(-2)xx20=0.8 Am^(2)`
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