GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
Electrostatic interaction. Photo 2 of 3. When two balloons are not electrically charged, they hang down loosely (Photo 1). When charged with charges of opposite sign, they attract each other (Photo 2). When charged with charges of the same sign, they repel each other (Photo 3). Photo 2 of 3.
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