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| Whiteboard |
| An electron is moving with a velocity v in the direction shown in the illustration. The electron enters a uniform magnetic field B directed out of the page, marked by the dotted lines as shown |
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Q1: On your whiteboard, make four illustrations of the electrons' path inside the dotted region, one for each of the following field strengths: (a) B = 0 inside
the region marked by the dotted-line |
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Comparing the motions of two different particles in one magnetic field
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Here, a uniform magnetic field is directed into the paper. A hydrogen ion (a proton; shown to the left as +q) and an alpha particle (two protons plus two neutrons; you get to draw it) enter the field having the same velocity. Assume the field is large enough so that the particles can execute complete circular trajectories within the field. Q2: On your whiteboard, calculate the relative sizes of the two circular paths and sketch them to scale showing the direction of travel for each. Recall equations for centripetal acceleration and force. Give explanations for your reasoning. |
| References |
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Arons, A. (1996), Teaching Introductory Physics, Wiley:
NY, p. 105. |
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