A conductor which is 30 cm long with a mass of 20 g is suspended horizontally in a magnetic field whose magnetic flux density is 0.12 T. What current is required in order that the magnetic force balances the gravitational force? If a 45 mg conductor that is 15 cm long is accelerating upward (against gravity) at 4.19 m/s in a 5.0 mT field, how much current must be flowing in the conductor?