PHYS 122 Midterm: Phys122Fall2014Exam2LectureLASol
Document Summary
Problems in sections a and b are independent. All components in the circuits shown are ideal. Resistor 1 and resistor 2 are in parallel, so the potential difference across them are the same. As you trace from the top of resistor 1 to the bottom of resistor 4, you encounter. 1 and 4 in succession, so they are not in parallel. Also, there is a junction between 1 and. The switch has been open for a long time. The capacitor acts like a short circuit immediately after the switch is closed. So, the potential difference across the capacitor and resistor r1 is zero. The potential differences across the capacitor and resistor r1 are the same. As the capacitor charges, the potential difference across it increases. As the potential difference across r1 increases, the current in r1 also increases.
