please help me with this problem please.. show solution also please.. i will give helpful rating promise.

A 150-g ball containing 4.81 x 10 excess electron (1.602 x 10 ) is dropped into a 125-m vertical shaft. At the bottom of the shaft, the ball suddenly enters a uniform horizontal magnetic field that has magnitude 0.51 T and direction from east to west. If air resistance is negligibly small, find the magnitude and direction of the force that this magnetic field exerts on the ball just as it enters the field. O 1.9e-9 N O 2.9e-10 N O 1.2e10 N 4.0e-18 NA current of 9.53 A flows vertically upward in a straight wire. What is the magnitude and direction of the magnetic field due to this long wire at a location 18.35 cm away and on the left side of the wire? 1.0e-5 T, into the paper (left side of the wire) and into the paper (right side) 1.0e-5 T, into the paper (left side of the wire) and into the paper (right side) 1.0e-5 T, out of the paper (left side of the wire) and into the paper (right side) 1.0e-5 T, out of the paper (left side of the wire) and into the paper (right side)