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Question

What happens when a positively charged glass rod is made to touch the metal knob of an electroscope?
  1. The leaves of the electroscope become negatively charged.
  2. The leaves of the electroscope would repel each other.
  3. The leaves of the electroscope become positively charged.
  4. The leaves of the electroscope would attract each other.


Solution

The correct options are
B The leaves of the electroscope would repel each other.
C The leaves of the electroscope become positively charged.
When a positively charged glass rod touches the metal knob of a gold leaf electroscope, the electrons travel from the leaves to the metal rod. As a result, the leaves become positively charged. Since the charge on both the leaves is the same, they are repelled away from each other, and hence, spread apart.

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