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The force acting on each pole of a magne...

The force acting on each pole of a magnet when placed in a uniform magnetic field of `7A//m` is `4.2xx10^(-4)N`. If the distance between the poles is `10 cm`, the moment of the magnet is

A

`15/pi`

B

`pi/15Am^(2)`

C

`7.5xx10^(-12)Am^(2)`

D

`6xx10^(-6)Am^(2)`

Text Solution

Verified by Experts

The correct Answer is:
A
`F=M/(2l)(mu_(0)H)`
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NARAYNA-MAGNETISM AND MATTER-EXERCISE - 1 (C.W)
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  5. A magnetic needle of pole strength 'm' is privoted at its centre. Its ...

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  6. Two identical "bar" magnets are jouned to form a cross. If this conbin...

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  7. A "bar" magnet of length 16 cm has a pole strength of 500 milli amp.m....

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  8. A "bar" magnet is at right angles to a uniform magnetic field. The cou...

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  9. A "bar" magnet of moment bar(M)=hat(i)+hat(j) is placed in a magnetic ...

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  10. A "bar" magnet of magnetic moment 1.5J//T is aligned with the directio...

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  11. The work done in turning a magnet of magnetic moment 'M' by an angle o...

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  12. A "bar" magnet of moment 4Am^(2) is placed in a nonuniform magnetic fi...

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  13. A magnet of length 10 cm and pole strength 4xx10^(-4)Am is placed in a...

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  14. A bar magnet of magnetic moment 2Am^(2) is free to rotate about a vert...

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  15. A bar magnet of length 10cm and pole strength 2 Am makes an angle 60^(...

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  16. The magnetic induction field strength at a distance 0.3 m on the axial...

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  17. A magnet of length 10 cm and magnetic moment 1Am^(2) is placed along t...

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  18. The length of a magnet of moment 5Am^(2) is 14cm. The magnetic inducti...

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  19. A pole of pole strength 80 Am is placed at a point at a distance 20cm ...

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  20. A short bar magnet produces manetic fields of equal induction at two p...

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