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A straight wire of length 30cm and mass 6mg lies in a direction 300 east of north. The earth’s field at this site is horizontal and has a magnitude of 0.8G. The current must be passed through the wire so that it may float in air is (g=10 ms-2) ……..A.

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Detailed Solution

Gravitational force should be balanced by magnetic force on wire, ⇒mg=Bilsinθ ⇒i=mgBlsinθ=6×10-6×100.8×10-4×0.3×12=5A

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A straight wire of length 30cm and mass 6mg lies in a direction 300 east of north. The earth’s field at this site is horizontal and has a magnitude of 0.8G. The current must be passed through the wire so that it may float in air is (g=10 ms-2) ……..A.