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A magnetic needle lying parallel to a ma...

A magnetic needle lying parallel to a magnetic field requires W units of work to turn through `60^(@)` . The external torque required to maintain the magnetic needle in this position is

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The correct Answer is:
`sqrt(3)X`
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FIITJEE-MAGNETISM AND MATTER-ASSIGNMENT PROBLEMS (SUBJECTIVE ) (LEVEL -1)
  1. What is sure test of magnetism?

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  2. A steel wire of length 'l' has a magnetic moment 'M'. It is bent in 'L...

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  3. A magnetic needle lying parallel to a magnetic field requires W units ...

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  4. A magnet of magnetic moment M is rotated through 360^(@) in a magnetic...

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  5. Magnetic moment of a short magnet is 16 A - m^(2) . What is the mag...

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  6. In which directions a compass needle kept at a magnetic pole will poi...

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  7. A dip needle arranged to move freely in the magnetic meridian dips by ...

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  8. Horizontal and vertical components of earth’s magnetic field at a plac...

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  9. The vartical component of the earth's magnetic field is zero at a plac...

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  10. In a tangent galvanometer , a small compass needle is palced at the...

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  11. A magnent when suspended freely in earth's magnetic field, oscillates ...

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  12. Which of the following properties is present in all the substances ?

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  13. A small rod of bismuth is suspended freely between the poles of a stro...

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  14. Some metals get magnetised by orientation of atomic magnetic moments i...

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  15. The magnetic moment of a magent of mass 78 gm is 10.2xx 10^(-7) A...

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  16. An iron bar of permeability 8.2 xx 10^(-3) Wb/A-m is placed in a m...

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  17. What is the relative permeability of air ?

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  18. Out of soft iron and steel which has more coercivity , less reten...

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