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A magnet of length 0.1 m and pole streng...

A magnet of length 0.1 m and pole strength `10^(-4) Am` is kept in a magnetic field of 30 Wb/m^(2) at an angle 30°. The couple acting on it is `......xx10^(-4) Nm.`

A

`7.5`

B

`3.0`

C

1.5

D

`6.0`

Text Solution

Verified by Experts

The correct Answer is:
D
`tau = MB sin theta = m xx ( 2l) xx B sin theta `
`= 10 ^(-4) xx 0.1 xx 30 sin 30 ^(@)`
`=1.5 xx 10 ^(-4) N-m`
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