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A magnet is suspended so as to swing hor...

A magnet is suspended so as to swing horizontally makes `50` vibrations//min at a place where dip is `30^(0)`, and `40` vibration//min where dip is `45^(0)`. Compare the earth's total fields at the two places.

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`nalphasqrt(B_(H))`
`rArrn_(1)/n_(2)=sqrt((B_(1)Costheta_(1))/(B_(2)Costheta_(2)))" "i.e50/40=sqrt(B_(1)/B_(2)xx(Cos30^(@))/(Cos45^(@)))`
`rArr25/16=B_(1)/B_(2)xx(sqrt3)/(sqrt2)(or)B_(1)/B_(2)=25/(8sqrt6)`
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NARAYNA-MAGNETISM AND MATTER-EXERCISE - 4 (SINGLE ANSWER TYPE QUESTION)
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  2. A paramagnetic sample shows a net magnetisation of 8Am^-1 when placed ...

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  3. A permanent magnet in the shape of a thin cylinder of length 10 cm has...

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  4. Hysteresis loops for two magnetic materials A and B are as given below...

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  5. A bar magnet of length 8 cm and having a pole strengh of 1.0 A m is pl...

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  6. Figure shows some of the equipotential surfaces of the magnetic scalar...

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  7. Two long equally magnetized needles are freely suspended by their like...

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  8. At a place on earth, horizontal component of earth's magnetic field is...

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  9. The coercivity of a small magnet where the ferromagnet gets demagnetis...

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  10. Statement A : A proton has spin and magnetic moment just like an elect...

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  11. The figure shows two diamagnetic spheres located near the south pole o...

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  12. Figure shows a loop model (loop L) for a diamagnetic material.

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  13. S is the surface of a lump of magnetic material .

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  14. The primary origin(s) of magnetism lies in

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  15. In a permanent magnet at room temperature.

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  16. A long solenoid has 1000 turns per metre and carries a current of 1A. ...

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  17. Essential difference between electrostatic shielding by a conducting s...

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  18. Let the magnetic field on earth be modelled by that of a point magnet...

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