Question: A 150-g ball containing 4.00 X 108 excess electrons is dropped into a 125-m vertical shaft. At the bottom of the shaft, the ball suddenly

A 150-g ball containing 4.00 X 108 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. 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.

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