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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

`5 A`

B

`25 A`

C

`50 A`

D

`75A`

Text Solution

Verified by Experts

The correct Answer is:
C
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AAKASH SERIES-APPENDICES ( REVISION EXERCISE )-REVISION EXERCISE (MOVING CHANGES & MEGNETISM)
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