A 150-g ball containing 4.00 x 10^8 excess electrons is dropped into a 125-m vertical shaft.  At the bottom of the shaft, the ball suddenly enters a uniform magnetic field that has magnitude 0.250 T and direction from east to west.  Ignoring air resistance, find the magnitude of the force that this magnetic field exerts on the ball just as it enters the field.

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Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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A 150-g ball containing 4.00 x 10^8 excess electrons is dropped into a 125-m vertical shaft.  At the bottom of the shaft, the ball suddenly enters a uniform magnetic field that has magnitude 0.250 T and direction from east to west.  Ignoring air resistance, find the magnitude of the force that this magnetic field exerts on the ball just as it enters the field.

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