Question

Problem 7 A resistor with resistance R, battery with voltage AV, capacitor with capacitance C, and switch are connected in series. The switch is closed at t = 0. The time constant of the circuit is T. What is the initial voltage across the resistor immediately after the student is closed? Select One of the Following: (a) o (b) AV (c) TAV (d) AV/T (e) AV/(R+C) Problem 8 A capacitor is charged to potential difference V and then allowed to discharge through a resistor. How does the potential difference across the capacitor change with time as the capacitor discharges? Select One of the Following: (a) The capacitor potential difference increases with time. (b) The capacitor potential difference decreases with time. (c) The capacitor potential difference stays the same. Problem 9 A capacitor can be charged by the battery when the switch at the right is closed. If the capacitor is initially uncharged, how does the brightness of the bulb change with time after the switch is closed? Select One of the Following: (a) The bulb becomes brighter with time. (b) The bulb becomes dimmer with time. (c) The bulb glows with a constant brightness.

Answer 1

(7) (8) Initially, there is no charge on Capacitor. Resistor voltage equals battery voltage 1. Auswer (b) or As the charge on capactor decreases, ats potential also decreases. 1 Answer (b) As the capactor charge increases with time, Current decreases with time, which causes bulb brightness to decrease with time Answer (6) 191