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A straight wire of mass 400 g and length...

A straight wire of mass 400 g and length 2m carries a current of 2A. It is suspended in mid air by a uniform horizontal field B. What is the magnitude of the magnetic field ?

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Verified by Experts

`F_(m)` is the magnetic force acting on the wire which acts upwards and balances mg. Thus
`B I l sin theta=mg`
`theta=90^(@)`

`B=(0.4xx9.8)/(2xx2xxsin 90^(@))`
`impliesB=0.98T`
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