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The period of oscillation of a magnet of...

The period of oscillation of a magnet of a vibraion magnetometer is `2.45` s at ione place and `4.9` s at the other, the ratio of the horzontal component of earth magnetic field at the two places is

A

`1:4`

B

`1:2`

C

`2:1`

D

`4:1`

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The correct Answer is:
D
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AAKASH INSTITUTE ENGLISH-MAGNETISM AND MATTER -ASSIGNMENT (SECTION B)
  1. A small bar magnet A oscillates in a horizontal plane with a period T ...

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  2. Two different magnets are tied together and allowed to vibrate in a ho...

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  3. The value of apparent angles of dip at two places measured in two mutu...

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  4. A bar magnet is placed with its north pole towards geographic north. T...

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  5. The value of horizontal component of earth's magnetic field at a place...

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  6. The period of oscillation of a magnet of a vibraion magnetometer is 2....

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  7. If phi is lattitude and del is dip at a place then

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  8. Magnetic susceptibility of a diamagnetic substances

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  9. Area of B-H curve measures the energy loss

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  10. A wire of length L metre carrying a current I ampere is bent in the fo...

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  11. Bohr magnetonis given by (symbols have their usual meanings)

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  12. The unit of magnetic susceptiblity is

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  13. One weber is equal to

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  14. If number of turns of cross-section of the coil of a tangent galvanome...

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  15. Two short bar magnets of magnetic moments m each are arranged at the o...

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  16. If declination at a place is known to be 15 ^(@) E. And a compass need...

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  17. The magnetic moment of the arrangment shown in the figure is

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  18. Two identical short bar magnets are placed at 120^(@) as shown in the ...

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  19. The work done in rotating a bar magnet of magnetic moment M from its u...

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  20. The variation of magnetic susceptibility (x) with absolute temperature...

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