A straight, stiff, horizontal wire of length 25 cm and mass 90 g is connected to a source of emf by light, flexible leads. A magnetic field of 1.33 T is horizontal and perpendicular to the wire. Find the current necessary to float the wire, that is, find the current for which the magnetic force balances the weight of the wire.

2.65 A

Explanation:

Given

Length of wire

mass of wire

Magnetic field

Force on wire due to magnetic field

Force due to magnetic field will balance the weight of wire

since you're a real machine, your ama is always less than your ima, because you can never totally eliminate friction.

from

explanation:

wind is defined by the direction it blows from.   for example, a wind blowing from north to south is called a northerly wind.