A straight wire of mass 200 g and length 1.5 m carries a current of 2 A. It is suspended in mid-air

Question

A straight wire of mass 200 g and length 1.5 m carries a current of 2 A. It is suspended in mid-air by a uniform horizontal magnetic field B. What is the magnitude of the magnetic field? (Take $g = 9.8	ext{ m/s}^2$)

Professor PC Thomas Classes · Answer

The magnetic force balances the weight of the wire. $IlB = mg$