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The ratio of magnetic fields on the axia...

The ratio of magnetic fields on the axial line of a long magnet at distance of `10cm` and `20cm` is `12:5.1.` The length of the magnet is

A

5cm

B

10cm

C

10m

D

15m

Text Solution

Verified by Experts

The correct Answer is:
B
`B_("axial")=mu_(0)/(4pi)(2Md)/((d^(2)-l^(2))^(2))`
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NARAYNA-MAGNETISM AND MATTER-EXERCISE - 2 (C.W)
  1. Two short bar magnets of equal dipole moments 'M' each are fastened pe...

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  2. The small magnets each of magnetic moment 10 A-m^(2) are placed end-on...

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  3. The ratio of magnetic fields on the axial line of a long magnet at dis...

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  4. Two short magnets AB and CD in the X-Y plane and are parallel to X-axi...

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  5. Two identical short bar magnets, each having magnetic moment M, are pl...

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  6. Magnetic inducton at a point on the axial line of a short bar magnet i...

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  7. A magnetic dipole is under the inflluence of two magnetic fields havin...

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  8. A short bar magnet is placed with its south pole facing geographic sou...

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  9. A bar magnet is placed with its North pole pointing North. Neutral poi...

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  10. A bar magnet is placed with its North pole pointing North. Neutral poi...

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  11. The period of a thin magnet in a magnetic field is 2s. It is cut into ...

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  12. A bar magnet suspended in magnetic meridian executes oscillations with...

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  13. Two bar magnets are bound together side by side and suspended. They sw...

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  14. A short bar magnet is oscillating in a magnetic field and its time per...

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  15. When two identical bar magnets placed one above the other, such that t...

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  16. A bar magnet suspended freely in uniform magnetic field is vibrating w...

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  17. A short bar magnet of magnetic moment 2Am^(2) and moment of inertia 6x...

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  18. The period of oscillation of a magnet at a place is 4seconds. When it ...

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

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  20. The magnetic needle of a V.M.M completes 10 oscillations in 92seconds....

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