Thin Magnetic

current required to remove tension in wires supporting a rod in a magnetic field?

a thin conducting rod, 80 cm long and mass of 10 grams is suspended horizontally by a pair of vertical flexible connecting wires in a region where the magnetic field B=0.4 T is horizontal and perpendicular to the rod. What current is required to flow in the rod to just remove the tension in the support wire?

the current should be such that the nmagnetic force is equal to the rod’s weight. so:

iLB = mg

=> i (0.8 x 0.4) = .01 x 9.8

=> i = 0.3 A

Aqualung – Thin Air (live)

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