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A straight wire of length 30 cm and mass...

A straight wire of length `30 cm` and mass `60 mg` lies in a direction `30^(@)` east of north.The earth's magnetic field at this is horizontal and has a magnitude of `0.8 G`.What current must be passed through the wire,so that it may float in air ?

A

5A

B

25A

C

50A

D

75A

Text Solution

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The correct Answer is:
C
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AAKASH SERIES-MOVING CHARGES AND MAGNETISM-EXERCISE-III
  1. A parabolic section of wire, as shown in figure is located in the X-Y ...

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  2. A semi circular current loop is placed in an uniform magnetic field of...

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  3. A straight wire of length 30 cm and mass 60 mg lies in a direction 30^...

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  4. A thin flexible wire of length L is connected to two adjacent fixed po...

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  5. The ratio of the magnetic field at the centre of a current carrying ci...

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  6. Two wires A and B are of lengths 40 cm and 30 cm. A is bent into a cir...

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  7. A circular coil of radius 2R is carrying current 'i' . The ratio of ma...

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  8. The magnetic field due to a current carrying circular loop of radius ...

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  9. A particle of charge q and mass m moves in a circular orbit of radius ...

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  10. The field due to a wire of n turns and radius r which carries a curren...

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  11. A charge Q is uniformly distributed over the surgace of non conducting...

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  12. Two circular coils are made from a uniform copper wire. Radii of circu...

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  13. A straight wire is first bent into a circle of radius 'r' and then int...

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  14. A long straight wire carrying current of 30 A is placed in an exte...

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  15. Two long parallel conductors cany currents i(1) = 3A and i(2) = 3A bot...

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  16. A straight wire of length (pi^(2)) metre is carrying a current of 2 A ...

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  17. A long straight wire of radius a carries a steady current is uniformly...

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  18. The total magnetic induction at point O due to curved portion and stra...

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  19. An infifnitely long conductor PQR is bent to form a right angle as sho...

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  20. A straight conductor of length 32 cm carries a current of 30A. Magneti...

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