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If a magnet of length 10cm and pole stre...

If a magnet of length `10cm` and pole strength `40 A-m` is placed at an angle of `45^(@)` in an uniform induction field of intensity `2xx10^(-4)T`, the couple acting on it is

A

`0.5656xx10^(4)Nm`

B

`0.5656xx10^(-3) Nm`

C

`0.65 xx10^(-4)Nm`

D

`0.66xx10^(4)Nm`

Text Solution

Verified by Experts

The correct Answer is:
B
`2l=10cm,m=40Am0=45^(@),B=2xx10^(-4)T tau=?`br`tau=MB sin theta=m2l B sintheta`
`40xx10xx10^(-2)xx2xx10^(-4)xxsin45`
`0.5656xx10^(-3) Nm`
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