PhysicsLAB AP Free Response Question
2002 C2 E&M

Printer Friendly Version
 
Your engineering firm has built the RC circuit shown above. The current is measured for the time t after the switch is closed at t = 0 and the best fit curve is represented by the equation
 
where i(t) is in milliamperes and t is in seconds.
 
 a. Determine the value of the charging voltage Vo predicted by the equation.

 b. Determine the value of the capacitance C predicted by the equation.

c. The charging voltage is measured in the laboratory and found to be greater than predicted in part a.
 
 i. Give one possible explanation for this finding.

 ii. Explain the implications that your answer to part i has for the predicted value of the capacitance.

d. Your laboratory supervisor tells that you the charging time must be decreased. You may add resistors or capacitors to the original components and reconnect the RC circuit. In parts i and ii below, show how to reconnect the circuit, using either an additional resistor or a capacitor to decrease the charging time.
 
 i. Indicate how a resistor may be added to decrease the charging time. Add the necessary resistor and connections to the following diagram.

 ii. Instead of a resistor, use a capacitor. Indicate how the capacitor may be added to decrease the charging time. Add the necessary capacitor and connections to the following diagram.




 
Topic Formulas
 
Related Documents




CB-ETS
Copyright © 1970-2022
All rights reserved.
Used with permission
Mainland High School
Daytona Beach, FL 32114