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# 5 turn off the power supply and move the spheres

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5) Turn off the power supply and move the spheres apart, then measure the magnitude and sign of the residual charge on the opposing uncharged sphere. Part 3; Capacitance 1) With one fixed plate, set them at a distance of 1mm with the power supplies’ black post attached to the fixed plate along with the electrometers black wire output. Then attach the zeroed out electrometers 30V red wire to the moveable plate’s joint. 2) Ensure the electrometer is not at the “Zero Lock” position but rather in the “Push to Zero” position. Adjust the power supply to 15V and touch the wire connected to the 30V position to the moveable plate to induce a charge on the plates from the power supply, this value will remain constant. 3) Without touching the plates, move the non-fixated plate to the required distances and record your observations. Data : Table 1 Conduction Charge Producer Electrometer Reading (in) [Volts] Electrometer reading (out) [Volts] #1 -19.5 0 #2 17.7 0 #1 (touch) -17.5 -17.5 #2 (touch) 14.1 14.1 #1 and #2 together -5 0 Remaining #1 -6 0 Remaining #2 4.2 0 Figure 1 To power supply

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Table 2 Capacitance Separation (mm) Electrometer Reading (Volts) 1 18 2 28 5 40 10 56 Analysis/Questions: Part 1: What can you conclude about the charge induced on the ice pail compared to the charge on the on the object? The magnitudes of the charged induced on the pail and of the charge on the object are the same. The sense of these charges is opposite, however. For example if a positive charged object is inserted into the pail, a negative charge is drawn towards it. Have you evidence in your readings to support the law of charge conservation? Explain what you think happens when you rub the charge “producers” together? Yes, our readings show that charges are, in general, balanced out and conserved. For every positive charge that is developed, a negative charge is also observed, conserving the charge of the system. I think the charge producers are each individually at equilibrium, with neutral charge, but once they are rubbed together, protons and electrons are traded off, creating a negative charge in one, and a positive charge in the other. No charge is actually “produced”, thus confirming the law of charge conservation. Is the charge actually “produced” or are plus and minus charges only separated? No charge is actually produced. The plus and minus charges are merely separated, as shown in the rubbing of the paddles together and in the results of the ice pail experiment. Part 2:
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5 Turn off the power supply and move the spheres apart then...

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