A wire is oriented along the axis. It is connected to two batteries, and a conventional current of 1.4 A runs through the wire in the direction. Along 0.20 m of the length of the wire there is a magnetic field of 0.58 T in the direction, due to a large magnet nearby. At other locations in the circuit, the magnetic field due to external sources is negligible. What are the direction and magnitude of the magnetic force on the wire

0.162 N acting in the +x direction.

Explanation:

Parameters given:

Current running in the wire, I = 1.4 A

Considerable length of wire, L = 0.2 m

Magnetic field due to magnet, B = 0.58 T

The magnetic force, F, is given as:

F = I * L * B

F = 1.4 * 0.2 * 0.58

F = 0.162 N

The magnetic force is positive, hence, it is acting in the same direction as the current, in the +x direction.

does anyone know or what?

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.