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.