A 0.2 kg conductor of length 0.8 m carries 2 ampere current to the right in a magnetic field. What is the magnitude and the direction of the magnetic field acting on the conductor if the net force on the rod is zero? (Assume that the rod is hung by two insulating supports.)

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anonymous · Answer

I realize it has something to do with the formula for the magnetic force in a current-carrying conductor; F=BILsintheta. But how to apply that formula? And why do I need the weight of the conductor?