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Question: A voltage of 400V is applied to the plates shown in Fig. 7.10.
a. If the plates have a separation of 20cm, calculate the magnitude and direction of the electric field.
b. Imagine you now send a particle of charge q = +2 e and mass m = 6.4 × 10-27 kg through the hole in the left plate, as shown in the figure. What would be the particle's initial velocity such that it slows down and stops right at the other plate (without crashing)?
c. Describe qualitatively the motion of the particle if you change the voltage to 200V (same polarity).
d. Now restore the voltage to 400V. Describe qualitatively the motion of the particle if you decrease its initial velocity from the value found in (b).
Fig. Region of electric field
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