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PHYS 206.001: Electricity and Magnetism
Assignment: Week 11 / Tuesday
1. (25 points) (Problems 13 in textbook / Chapter 28)
(a) Find the equivalent resistance between points a and b in the figure below. (a) Calculate the current in each
resistor if a potential difference of 34.0 V is applied between points a and b.
2. (25 points) (Problems 30 in textbook / Chapter 28)
In the circuit below, determine (a) the current in each resistor and (b) the potential difference across the 200 Ω
resistor.
1
3. (25 points) (Problems 43 in textbook / Chapter 28)
The circuit shown below has been connected for a long time.
(a) What is the potential difference across the capacitor?
(b) If the battery is disconnected from the circuit, over what time interval does the capacitor discharge to
one-tenth its initial voltage?
4. (25 points) (Problems 45 in textbook / Chapter 28)
A charged capacitor is connected to a resistor and switch as shown below. The circuit has a time constant of
1.50 second. Soon after the switch is closed, the charge on the capacitor is 75.0 % of its initial charge.
(a) Find the time interval required for the capacitor to reach this charge.
(b) If R = 250 kΩ, what is the value of capacitance C?
2
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