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A straight wire, of length L, carrying a...

A straight wire, of length L, carrying a current I, stays suspended horizontally in mid air in a region where there is a uniform magnetic field `vecB`. The linear mass density of the wire is `lambda`. Obtain the magnetic of this magnetic field.

Text Solution

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The wire remains suspended if weight of wire
=force exerted by magnetic field, i.e.,
`mg=ILB sin 90^@` or `lambdaLg=ILB` or `B=lambdag//I`
The direction of `vecB` must be horizontal and perpendicular to the length of wire.
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