The pair of horizontal plates shown below is used to deflect electrons up or down in the television set by placing a potential difference across them. The plates have length 0.04 m and separation 0.012 m, and the right edge of the plates is 0.50 m from the screen. A potential difference of 200 V is applied across the plates, and the electrons are deflected toward the top of the screen. Assume that the electrons enter horizontally midway between the plates with a speed of 6.0 x 107 m/sec and that fringing effects at the edges of the plates and gravity are negligible.
| (b) Which plate in the pair must be at the higher potential for the electrons to be deflected upward? Check the appropriate box below and then justify your answer. |
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(c) Considering only an electron's motion as it moves through the space between the plates, compute the following.