A thin, horizontal copper rod is 1.0792 m long and has a mass of 53.1794 g. The acceleration of gravity is 9.8 m/s 2 . What is the minimum current in the rod that will cause it to float in a horizontal magnetic field of 2.88578 T

0.1675 A

Explanation:

Since then making I the subject where L is the length of the rod, in this case given as 1.0792 m, B is magnetic field which is given as 2.88578 T, m is the mass which is  53.1794 g which is equivalent to 0.0531794 Kg . For minimum current,

Substituting the given values then

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.