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PHYS 221 Recitation Quiz

This quiz focuses on electrostatics and capacitors, covering concepts such as energy stored in a parallel-plate capacitor with a dielectric and the electric field generated by point charges on the x-axis. Students are tasked with calculating the energy stored in a capacitor charged to a potential difference and understanding the resultant electric field at the origin due to fixed point charges. This is an essential exercise for mastering fundamental physics concepts in electrostatics and energy storage in capacitance.

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PHYS 221 Recitation Quiz

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  1. PHYS 221 Recitation Quiz Kevin Ralphs Week 3

  2. Quiz Question 1

  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

  4. 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

  5. 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

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