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A straight, horizontal wire of mass 10mg and length 1.0m carries a current of 2.0A.

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A straight, horizontal wire of mass 10mg and length 1.0m carries a current of 2.0A. What minimum magnetic field B should be applied in the region so that the magnetic force on the wire may balance its weight?

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Mass = 10mg = 10–5kg

Length = 1m

I = 2A, B = ?

Now, Mg = ilB

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