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A magnetic needle of pole strength 'm' i...

A magnetic needle of pole strength `'m'` is privoted at its centre. Its `N-`pole is pulled eastward by a string. Then the horizontal force required to produce a deflection of `theta` from magnetic meridian `(B_(H) "horizontal componet of earths magnetic field")`

A

`mBcostheta`

B

`mBsintheta`

C

`mBtantheta`

D

`mBcottheta`

Text Solution

Verified by Experts

The correct Answer is:
C
`tau=MBsintheta`
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NARAYNA-MAGNETISM AND MATTER-EXERCISE - 1 (C.W)
  1. The force acting on each pole of a magnet when placed in a uniform mag...

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  2. An iron specimen has relative permeability of 600 when placed in unifo...

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  3. A magnetic needle of pole strength 'm' is privoted at its centre. Its ...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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  19. Two short bar magnets with magnetic moments 8Am^(2) and 27Am^(2) are p...

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  20. A short magnetic needle is pivoted in a uniform magnetic field of indu...

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