Lecture 7 worksheet

# Lecture 7 worksheet - NAME 1 There is a uniform-field...

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NAME _______________________________________________ 1. There is a uniform ? -field inside the box shown to the right. An electron (negative charge) enters the box from the left and follows the curved path shown at constant speed. a. What direction does the acceleration point at location A? Describe the angle the acceleration vector makes with the velocity vector at that location. The electron is moving with constant speed along a curved path that is part of a circle. The acceleration points toward the center of this circle (this is always the case for circular motion with constant speed). The velocity vector is directed along the path the electron travels, so it is tangent to the circle. Thus, the acceleration and velocity are perpendicular to each other as shown. b. What direction does the magnetic force on the electron point at location A? In what direction does the ? -field point? Explain your reasoning. Newton’s second law says that ∑? = 𝑚𝑎 . This tells us that the acceleration is parallel to the net force. In this problem, the only force acting on the electron is the magnetic force.

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