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A small magnetic needle performs 10 osci...

A small magnetic needle performs 10 oscillations/minute in the earth's horizontal magnetic field . When a bar magnet is placed near the small magnet in same position , frequency of oscillations becomes `10sqrt2` oscillations/minute . If the bar magnet be turned around end to end , the rate of oscillation of small magnet will become

A

` 4:7 `

B

`7:4`

C

`5:4`

D

` 4:5`

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AAKASH SERIES-APPENDICES ( REVISION EXERCISE )-REVISION EXERCISE (MAGNETISM AND MATTER )
  1. A bar magnet takes pi/10 seconds to complete one oscillation in unifor...

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  2. A small magnet of moment 4.8 xx 10^(-2) J/T is suspended freely in t...

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  3. A short bar magnet used in a vibration magnetometer is heated so as to...

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  4. A compass needle makes 10 oscillations per minute in the earths horizo...

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  5. The magnetic needle of a vibration magnetometer makes 12 oscillations ...

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  6. A combination of two identical bar magnets are placed one over the oth...

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  7. A small magnetic needle performs 10 oscillations/minute in the earth's...

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  8. The time period of oscillation of a magnet in a vibration magnetometer...

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  9. A small magnetic needle performs 10 oscillations/minute in the earth's...

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

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  11. A small magnetic needle performs 10 oscillations/minute in the earth's...

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  12. A deflection magnetometer is adjusted in the usual way . When a magnet...

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  13. A short magnet oscillates in an oscillation magnetometer with a time p...

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  14. Two magnets are held in a viberation magnetometer and are allowed to o...

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  15. With a standard rectangular bar magnet, the time period of a vibration...

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  16. A magnet makes 40 oscilations per minute at a place having magnetic fi...

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  17. Obtain the earth's magnetisation, assuming that the earth's field can ...

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  18. The plane of a dip circle is set in the geographic meridian and the ap...

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  19. A dip circle lying initially in the magnetic meridian is rotated throu...

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  20. If theta(1) and theta(2) be the apparent angles of dip observed in two...

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