A 150 g ball containing 4.00 x 10° excess electrons 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 0.250 T and direction from east to west. Considering the air resistance is negligibly small: (a) Find the speed at the bottom of the shaft. (b) Find the magnitude of the force that this magnetic field exerts on the ball just as it enters the field. Select one: V = 49.5 m/s, F = 3.25 x 10 10 N V = 1.15 m/s, F= 3.25 x 10 10 N V = 15.4 m/s, F = 2.13 x 10 10 N V = 15.4 m/s, F= 7.93 x 10 10 N v = 49.5 m/s, F = 7.93 x 10-10 N V = 15.4 m/s, F = 3.25 x 10 10 N

A 150 g ball containing 4.00 x 10° excess electrons 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 0.250 T and direction from east to west. Considering the air resistance is negligibly small: (a) Find the speed at the bottom of the shaft. (b) Find the magnitude of the force that this magnetic field exerts on the ball just as it enters the field. Select one: V = 49.5 m/s, F = 3.25 x 10 10 N V = 1.15 m/s, F= 3.25 x 10 10 N V = 15.4 m/s, F = 2.13 x 10 10 N V = 15.4 m/s, F= 7.93 x 10 10 N v = 49.5 m/s, F = 7.93 x 10-10 N V = 15.4 m/s, F = 3.25 x 10 10 N