Using the proof plane and the rubber rod, charge the electroscope fully, by the method discussed above. Now, charge the glass rod by rubbing it with the silky cloth. Bring the glass rod close (but not too close) to the electroscope knob. (If it comes too close, a spark may jump and the movable leaf will be nothing but gold shrapnel.) You should see the electroscope leaf collapse slightly as the glass rod is brought near. If this does not work, you may have too much negative charge on the electroscope. Scoop some off using the proof piane and deposit it on the ground fixture. (a) Explain how the extra electrons on the electroscope move as the positively charged glass rod comes close, and why. Notice the net charge on the combination of electroscope leaves plus knob does not change, since no charge transfers to or from the glass rod.

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II. Unlike Charges Attract
Using the proof plane and the rubber rod, charge the electroscope fully, by the method discussed
above. Now, charge the glass rod by rubbing it with the silky cloth. Bring the glass rod close (but
not too close) to the electroscope knob. (If it comes too close, a spark may jump and the
movable leaf will be nothing but gold shrapnel.) You should see the electroscope leaf collapse
slightly as the glass rod is brought near. If this does not work, you may have too much negative
charge on the electroscope. Scoop some off using the proof plane and deposit it on the ground
fixture.
(a) Explain how the extra electrons on the electroscope move as the positively charged glass rod
comes close, and why. Notice the net charge on the combination of electroscope leaves plus
knob does not change, since no charge transfers to or from the glass rod.
(b) Since we are assuming the glass rod is positively charged, how does this experiment
illustrate the attraction between unlike charges?
Transcribed Image Text:II. Unlike Charges Attract Using the proof plane and the rubber rod, charge the electroscope fully, by the method discussed above. Now, charge the glass rod by rubbing it with the silky cloth. Bring the glass rod close (but not too close) to the electroscope knob. (If it comes too close, a spark may jump and the movable leaf will be nothing but gold shrapnel.) You should see the electroscope leaf collapse slightly as the glass rod is brought near. If this does not work, you may have too much negative charge on the electroscope. Scoop some off using the proof plane and deposit it on the ground fixture. (a) Explain how the extra electrons on the electroscope move as the positively charged glass rod comes close, and why. Notice the net charge on the combination of electroscope leaves plus knob does not change, since no charge transfers to or from the glass rod. (b) Since we are assuming the glass rod is positively charged, how does this experiment illustrate the attraction between unlike charges?
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