V. Electric Fields (Be sure to disconnect the cup from the electroscope.) This exercise is only to see what happens qualitatively and to think of what you see in terms of an electric field. Using the rubber rod, charge the electroscope by induction. (See previous exercise.) This should leave it positively charged. Now recharge the rubber rod as much as possible and move it slowly toward the glass on the front of the case of the electroscope, but of course, not too close. About 3 meters should be good. Notice the response of the gold foil to any motion of the rod? Notice the field acts right through the glass. The response would be the same even if there were a complete vacuum, that is empty space, between the rod and the gold foil. The electric force acts at a distance between the two charged objects, even through empty space. Try also bringing a charged glass rod up in place of the rubber rod. (a) How does the gold leaf respond in each case? (b) How does this indicate action at a distance? What seems to act on what "at a distance" here? (c) Explain the role of the electric field in this observation
V. Electric Fields (Be sure to disconnect the cup from the electroscope.) This exercise is only to see what happens qualitatively and to think of what you see in terms of an electric field. Using the rubber rod, charge the electroscope by induction. (See previous exercise.) This should leave it positively charged. Now recharge the rubber rod as much as possible and move it slowly toward the glass on the front of the case of the electroscope, but of course, not too close. About 3 meters should be good. Notice the response of the gold foil to any motion of the rod? Notice the field acts right through the glass. The response would be the same even if there were a complete vacuum, that is empty space, between the rod and the gold foil. The electric force acts at a distance between the two charged objects, even through empty space. Try also bringing a charged glass rod up in place of the rubber rod. (a) How does the gold leaf respond in each case? (b) How does this indicate action at a distance? What seems to act on what "at a distance" here? (c) Explain the role of the electric field in this observation
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Transcribed Image Text:V. Electric Fields
(Be sure to disconnect the cup from the electroscope.) This exercise is only to see what happens
qualitatively and to think of what you see in terms of an electric field. Using the rubber rod,
charge the electroscope by induction. (See previous exercise.) This should leave it positively
charged.
Now recharge the rubber rod as much as possible and move it slowly toward the glass on the
front of the case of the electroscope, but of course, not too close. About .3 meters should be
good. Notice the response of the gold foil to any motion of the rod? Notice the field acts right
through the glass. The response would be the same even if there were a complete vacuum, that
is empty space, between the rod and the gold foil. The electric force acts at a distance between
the two charged objects, even through empty space. Try also bringing a charged glass rod up in
place of the rubber rod.
(a) How does the gold leaf respond in each case?
(b) How does this indicate action at a distance? What seems to act on what "at a distance" here?
(c) Explain the role of the electric field in this observation
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