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A magnet is suspended in such a way that...

A magnet is suspended in such a way that it oscillates in the horizontal plane. It makes 20 oscillations per minute at a place where dip angle is `30^(@)` and 15 oscillations minute at a place where dip angle is `60^(@)`. The ratio of total earth's magnetic field at the two places is

A

`3sqrt3:8`

B

`19:9 sqrt3`

C

`4:9`

D

`2sqrt3:9`

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The correct Answer is:
B
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AAKASH INSTITUTE-MAGNETISM AND MATTER -ASSIGNMENT (SECTION A)
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  2. The magnetic moments of two bar magnets of same size are in the ratio ...

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  3. Magnetostatic screening or shielding can be created by

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  4. Planets producing larger magnetic field have larger

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  5. To shield an instrument from external magnetic field, it is placed ins...

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  6. A dip needle lies initially in the magnetic merdian when it shows an a...

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  7. The real angle of dip, if a magnet is suspended at an angle of 30^(@) ...

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  8. A dip needle free to move in a vertical plane perpendiculr to the magn...

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  9. If theta1 and theta2 be the apparent angles of dip observed in two ver...

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  10. How many neutral points will be obtained when a bar magnet is kept wit...

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  11. Time period of cillations of a magnet of magnetic moment M and moment ...

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  12. A magnet is suspended in such a way that it oscillates in the horizont...

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