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A very long bar magnet is placed with it...

A very long bar magnet is placed with its north pole coinciding with the centre of a circular loop carrying an electric current. `i`. The magnetic field due to the magnet at a point on the periphery of the wire is `B`. The radius of the loop is `a`. The force on the wire is

A

Nearly `2 pi a I B` perpendicular to the plane of the wire

B

`2pi a I B` in the plane of the wire

C

`pi aiB` along the axis of the wire

D

zero

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The correct Answer is:
A
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AAKASH INSTITUTE ENGLISH-MAGNETISM AND MATTER -ASSIGNMENT (SECTION A)
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  2. If L be the length of a bar magnet then separation between the two pol...

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  3. Two identical thin bar magnets each of length l and pole strenght ...

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  4. A solenoid of length 10 cm and radius 1 cm contains 200 turns and carr...

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  5. A long magnetic needle of length 2L, magnetic moment M and pole stre...

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  6. A magnetic of magnetic moment M and pole strength m is divided in two ...

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  7. A steel wire of length l has a magnetic moment M. It is bent into a se...

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  8. Points A and B are situated perpendicular to the axis of a 2cm long ba...

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  9. Figure shows two identical magnetic dipoles a and b of magnetic moment...

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  10. Two short magnets of equal dipole moments M are fastened perpendicular...

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  11. Two small bar magnets are placed in a line with like poles facing each...

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  12. A magnetic needle lying parallel to a magnetic field requires X units ...

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  13. Potential energy of a bar mangnet of magnetic moment M placed in a mag...

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  14. A magnetic dipole is placed at right angles to the direction of lines ...

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  15. Which of the following statements regarding magnetic lines of force is...

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  16. A thin magnetic needle oscillates in a horizontal plane with a period ...

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  17. The time period of a freely suspended magnet is 4 secs. If it is broke...

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  18. The magnetic moments of two bar magnets of same size are in the ratio ...

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  19. Magnetostatic screening or shielding can be created by

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  20. Planets producing larger magnetic field have larger

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