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A bar magnet of length 10cm and pole str...

A bar magnet of length `10cm` and pole strength `2 Am` makes an angle `60^(0)` with a uniform magnetic field of induction `50T`. The couple acting on it is

A

`5sqrt3Nm`

B

`sqrt3Nm`

C

`10sqrt3Nm`

D

`20sqrt3Nm`

Text Solution

Verified by Experts

The correct Answer is:
A
`C=MB sin theta`
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Knowledge Check

  • 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)N-m`
    B
    `0.5656xx10^(-3)N-m`
    C
    `0.656xx10^(-4)N-m`
    D
    `0.656xx10^(-5)N-m`

  • The magnetic moment of a length 10 cm and pole strength 4.0 Am will be

    A
    `0.4 Am^(2)`
    B
    `1.6 Am^(2)`
    C
    `20 Am^(2)`
    D
    `8.0 Am^(2)`

  • A magnet of length 0.1 m and pole strength 10^(-4) A.m. 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
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    B
    `3.0`
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