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A straight conducting rod of length l a...

A straight conducting rod of length l and mass m is suspended in a horizontal plane by a pair of flexible strings in a magnetic field of magnitude B. To remove the tension in the supporting strings, the magnitude of the current in the wire is .

A

`(mg B)/(l)`

B

`(mg l)/(B)`

C

`(mg)/(lB)`

D

`(lB)/(mg)`

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