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A wire of length l in formed into a circ...

A wire of length l in formed into a circular loop of one turn only and is suspended in a magnetic field B. When a current I is passed through the loop, the torque experienced by it is

A

`((1)/(4pi)) Bil`

B

`((1)/(4pi)) l^(2)iB`

C

`((1)/(4pi)) B^(2)il`

D

`((1)/(4pi)) Bi^(2)l`

Text Solution

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The correct Answer is:
B
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AAKASH INSTITUTE ENGLISH-MOVING CHARGES AND MAGNETISM-Assignment (Section A) Objective Type Questions (One option is correct)
  1. When two wires have current in same direction then force is

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  2. A rectangular loop carrying a current i(2) situated near a long straig...

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  3. Two parallel conductor A and B of equal length carry current l and 10 ...

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  4. A and B are two conductors carrying a current i in the same direction ...

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  5. Two long parallel copper wires carry current of 5A each in opposite di...

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  6. A, B and C are parallel conductors of equal length carrying currents I...

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  7. A conducting circular loop of radiius r carries a constant current i. ...

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  8. A conductor PQ, carrying a current i is placed perpendicular to a long...

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  9. The force between two parallel conductor, each of length 50m and dista...

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  10. A circular wire ABC and a straight conductor ADC are carrying current ...

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  11. The magnetic moment of a current I carrying circular coil of radius r ...

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  12. Two galvanometers A and B require 3 mA and 6 mA respectively, to produ...

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  13. Magnetic dipole moment of rectangular loop is

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  14. Magnetic induction produced at the centre of a circular loop carrying ...

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  15. A straight wire carrying current I is turned into a circular loop. If ...

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  16. The current sensitivity of a moving coil galvanometer can be increased...

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  17. A rectangular coil 20cmxx20cm has 100 turns and carries a current of 1...

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  18. A wire of length l in formed into a circular loop of one turn only and...

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  19. A wire fo length l is bent in the from of a circular coil of some tur...

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  20. The restoring couple in the moving coil galvanometer is due to

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