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Homework #3 - Solutions

# Homework #3 - Solutions - V 4 3(i Figure 1 shows a plot of...

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Homework set #3. Solutions.

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Conceptual Problems 1. A parallel-plate capacitor is connected to a battery that maintains a constant potential difference V between the plates. If a dielectric is inserted between the plates of the capacitor, do the following quantities increase, decrease, or remain the same? o The electric field between the plates: (a) Increase (b) Decrease (c) Remain the same. o The charge on the plates: (a) Increase (b) Decrease (c) Remain the same . : o The capacitance: (a) Increase (b) Decrease (c) Remain the same. o The energy stored in the capacitor: (a) Increase (b) Decrease (c) Remain The same. 2. The four conducting cylinders shown in the Figure below are all made of the same material, though they differ in length and/or diameter. They are connected to four different batteries, which supply the necessary voltages to give the circuits the same current, I . Rank the four voltages, and in order of increasing value. Indicate ties where appropriate. V V 1 , V 2 , V 3 , V 4 , 2 , V 3 , V 1

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Unformatted text preview: , V 4 3. (i) Figure 1 shows a plot of current versus voltage for two different materials, A and B. Which of these materials satisfies Ohm’s law? a. A b. B (ii) Figure 1 shows plots for two materials, A and B, Which material has the greater resistance at the voltage V 1 ? o A o B Figure 1 4. A fuse is a device to protect a circuit from the effects of a large current. The fuse is a small strip of metal that burns through when the current in it exceeds a certain value, thus producing an open circuit. Should a fuse be connected in series or in parallel with the circuit it is intended to protect? o Series o Parallel 5. Consider the circuit shown in the Figure below in which three lights, each with a resistance R , are connected in series. The circuit also contains an open switch. o When the switch is closed, does the intensity of light : (i) Increase (ii) Decrease (iii) Stay the same o Do the intensities of lights 1 and 3: (i) Increase (ii) Decrease (iii) Stay the same...
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Homework #3 - Solutions - V 4 3(i Figure 1 shows a plot of...

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