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.
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) \(\frac{mgB}{l}\)
(b) \(\frac{mgl}{B}\)
(c) \(\frac{mg}{lB}\)
(d) \(\frac{lB}{mg}\)
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