Where was the charge before it moved?

Name____________________________________Date ______________________ Hour ______WHERE DOES THE MOVING CHARGE COME FROM?Investigation 2: Where was the charge before it moved?Assemble Circuit A shown below, but do not complete the loop. It is the same circuityou used before. Note that the compass is underneath the wire, not connected to thecircuit. Tape the compass to the table so that the needle is pointing along the North-Southline. Leave the compass in this position throughout the lab.+R#1 #2R#1 #2-#4RA-Charging#31. Draw on each diagram above an arrow (or arrows) showing the direction chargemoves during the charging and discharging process.#4RB-Discharging#32.a. Charge the capacitor with wire #1 placed over the compass needle (the wireshould be lined up with the needle and held in place). Observe the compassneedle and record the direction the needle moves and the amount of motion in thetable below.b. Keeping everything in place, discharge the capacitor and observe the compassneedle. Record your observations in the table below.3. Rotate the circuit over the compass so that you can study the remaining wiresindividually. Observe the direction (East or West) and amount of turn of the compassneedle during charging and discharging for each wire and record your observations inthe table below.Wire #1Wire #2Wire #3Wire #4Direction(E or W)ChargingAmount of turn(# of ticks)Direction(E or W)DischargingAmount of turn(# of ticks)

Investigation QuestionsConclusions4.a. Is the same thing happening in everywire in the charging circuit?b. How do you know?5.a. Is the same thing happening in everywire in the discharging circuit?b. How do you know?6. Where do you think the charge comesfrom that lights the bulb closest to thepositive end of the battery during thecharging process? Explain.7. Where do you think the charge comesfrom that lights the bulb closest to thenegative end of the battery during thecharging process? Explain.8. Where do you think the charge comesfrom that lights the bulbs during thedischarging process? Explain.9.a. True or False (circle the correct answer): If charge is moving in one part of thecircuit, then charge is moving everywhere in the circuit.b. How do you know?10.a. Are the wires ever empty of charge?b. Explain your answer.

Review the figures below. Decide where you think the very first charge that moves pasteach labeled point came from. Write your answers in the table below.ARB+ #1 #2ABR#1 #2-E#4RA-Charging#3CD#4#3RF EB-DischargingCDPoint APoint BPoint CPoint DPoint ESource of Charge DuringCHARGINGSource of Charge DuringDISCHARGING