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A straight horizontal wire of mass 10mg and length 1.0 cm carries a current of 2.0 A. 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 =` 10 mg = 10^(-6) kg`
` length = 1m , I = 2A , B = ?`
Now` mg = iLB
rArr B = mg/ il = 4.9 xx 10 ^(-6) T`
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