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PHYS 221 Recitation Quiz. Kevin Ralphs Week 3. Quiz Question 1. Quiz Question 2.
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PHYS 221 Recitation Quiz Kevin Ralphs Week 3
Quiz Question 2 A parallel-plate capacitor with an area of 1.0 cm2 and a plate spacing of 0.20 mm is charged until a potential difference of 10 V is across the plates. It is then disconnected so that the charge cannot change. If a dielectric with is inserted between the plates, what is the energy stored in the capacitor? • 442 nJ • 44.2 pJ • 2.21 μJ • 221 pJ
Quiz Question 3 Two point charges are fixed on the x axis. Each has a positive charge q. One is at x = -a, the other is at x = +a. At the origin, which of the following is true? • and • and • in the positive x-direction and • in the positive x-direction and • None of the above
Quiz Question 4 Two point charges are fixed on the x axis. One point charge has a positive charge +q and the other has a negative charge –q. The positive charge is at x = -a and the negative point charge is at x = +a. At the origin, which of the following is true? • and • and • in the positive x-direction and • in the positive x-direction and • None of the above