1. 35 th International Physics Olympiad Pohang, Korea 15 ~ 23 July 2004 Theoretical Competition Saturday, 17 July 2004 Theoretical Question 1

2. 35th International Physics Olympiad Theoretical Competition, Saturday, 17 July 2004 “Ping-Pong Resistor” Theoretical Question 1: “Ping-Pong Resistor” d V R Objective: To find current through the capacitor plates

3. 35th International Physics Olympiad Theoretical Competition, Saturday, 17 July 2004 “Ping-Pong Resistor” Theoretical Question 1: “Ping-Pong Resistor” d V R mg t r d q +V side view Q=CV F=qE - mg Problem design:

4. 35th International Physics Olympiad Theoretical Competition, Saturday, 17 July 2004 I-V Curves

5. 35th International Physics Olympiad Theoretical Competition, Saturday, 17 July 2004 “Ping-Pong Resistor” Theoretical Question 1: “Ping-Pong Resistor” Physical concepts required: Electrostatics  Electric Field, Potential  Gauss’ Law  Current Mechanics  Energy Conservation  Collisions  Kinematics V R d