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Electric Forces
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| Whiteboard |
| A pith ball is hung from a nylon string so that it falls in-between two metal cans A and B. |  |
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Can A is charged positive by contact with a positively charged rod. |
| The charged can attracts the pith ball; the pith ball makes contact with the can then swings back toward can B. The ball makes contact with can B and then begins to oscillate back and forth, between the two cans. |  |
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Q1: Sketch how the charged can attracts the pith ball in the first place. Q2: Sketch what happens when the charge can and the pith ball contact one and other. Q3: Why the ball begins to oscillate between the two cans. Recall conventional current as well as the displacement of negative charges. Advanced Question: Will the oscillating stop? Explain why the pith ball will or will not stop. |
| References |
| Arons, A. (1996), Teaching Introductory Physics, Wiley: NY, p. 73. |
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