4/11/19 EXAM 3 Problem 1. Circuits. (a) Consider the circuit in the diagram. Us- ing Kirchoff's Laws, 'solve' the circuit, including finding all the currents and volt- age drops. In particular, you should fig- ure out what value of R will result in 10 a b points a and b having equal electric po- tential. (In other words, the potential difference a.k.a. voltage between a and b is zero.) 20 L (b) Supposing that part (a) worked, and points a and b have equal electric potential, what would happen if they were connected by a wire? How would the circuit change, if at all? (c) Suppose that the circuit was further modified by replacing the resistor R with an uncharged capacitor C. Assume the wire from part (b) IS present. Describe, in as much detail as you can (words and equations are both good), what will happen to the circuit over time. If you can, compute the final voltage across the capactor (after many many time constants have passed).

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Publisher:Robert L. Boylestad
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How do you find the current of the 20 ohm resistor?

4/11/19
EXAM 3
Problem 1. Circuits.
(a) Consider the circuit in the diagram. Us-
ing Kirchoff's Laws, 'solve' the circuit,
including finding all the currents and volt-
age drops. In particular, you should fig-
ure out what value of R will result in
10
a
b
points a and b having equal electric po-
tential. (In other words, the potential
difference a.k.a. voltage between a and
b is zero.)
20 L
(b) Supposing that part (a) worked, and points a and b have equal electric potential, what would
happen if they were connected by a wire? How would the circuit change, if at all?
(c) Suppose that the circuit was further modified by replacing the resistor R with an uncharged
capacitor C. Assume the wire from part (b) IS present. Describe, in as much detail as you
can (words and equations are both good), what will happen to the circuit over time. If you
can, compute the final voltage across the capactor (after many many time constants have
passed).
Transcribed Image Text:4/11/19 EXAM 3 Problem 1. Circuits. (a) Consider the circuit in the diagram. Us- ing Kirchoff's Laws, 'solve' the circuit, including finding all the currents and volt- age drops. In particular, you should fig- ure out what value of R will result in 10 a b points a and b having equal electric po- tential. (In other words, the potential difference a.k.a. voltage between a and b is zero.) 20 L (b) Supposing that part (a) worked, and points a and b have equal electric potential, what would happen if they were connected by a wire? How would the circuit change, if at all? (c) Suppose that the circuit was further modified by replacing the resistor R with an uncharged capacitor C. Assume the wire from part (b) IS present. Describe, in as much detail as you can (words and equations are both good), what will happen to the circuit over time. If you can, compute the final voltage across the capactor (after many many time constants have passed).
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