A horizontal wire with a mass per unit length of 0.2 kg/m carries a current of 4 A in the...

A horizontal wire with a mass per unit length of 0.2 kg/m carries a current of 4 A in the x-direction. If the wire is placed in a uniform magnetic flux density B, what should the direction and minimum magnitude of B he in order to magnetically lift the wire vertically upward? [Hint: The acceleration due to gravity is g = –9.8 m/s2.]