PHYS 1404-004 Homework 5 – 03/14/2016
Due March 24th, 2016
Homework should be written out neatly on a separate sheet of paper. Explain your
reasoning.
1. In the circuit below both meters are idealized, the battery has no appreciable internal
resistance, and the ammeter reads 1.39 A. (Let R1 = 52.0 Ω, R2 = 29.0 Ω, and R3 = R4 = 19
Ω.). What does the voltmeter read? What is the emf (i.e., the voltage) of the battery?
(Hint: Start with the parallel combination. There are six steps to solve the entire
problem.)
2. In the circuit shown in the following figure, the voltage across the R1 = 7.00-Ω resistor is
21.0 V. What are the emf of the battery and the current through the 6.00-Ω resistor? (Let
R2 = 1.00 Ω.)
3. In the figure below, all R1’s are 50 Ω and all R2’s are 25 Ω. What is the equivalent
resistance of the combination?
4. The batteries shown in the figure have negligibly
small internal resistors. Assuming that 𝜀𝜀 = 10.0 𝑉𝑉
and 𝑅𝑅 = 20.0 𝛺𝛺, find the current through
a. the 30.0 𝛺𝛺 resistor,
b. the 20.0 𝛺𝛺 resistor,
c. and the 10.0 𝑉𝑉 battery.
5. The resistance between terminals a and b in the figure is 75 𝛺𝛺. If the resistors labelled R
have the same value, determine R.
6. Find the current in the 12 𝛺𝛺 resistor in the figure below.
7. You are given four resistors, each with resistance R. Devise a way to connect these
resistors so that the total equivalent resistance is R. You must use all the resistors so that
there is current through each one if a battery is connected.