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Science Answer the following questions:[1 M]

Static Electricity · Maharashtra Board STD 7 (MSBSHSE - English Medium). 4 questions.

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Answer the following questions:[1 M]

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4 questions · self-marked practice — reveal the answer and mark yourself.

Question 11 Mark
Draw a neat labelled diagram of Gold leaf electroscope and describe it.
Answer

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  1. This is a simple device to detect the electric charge on object.
  2. It consists of a copper rod which has a metal disc at the upper end and two thin gold leaves at the other.
  3. The rod is placed in a bottle so that the disc is above the bottle.
  4. When an uncharged object is taken near the disc, the leaves remain closed.
  5. When a charged object is taken near the disc, both the leaves are charged by the same electric charge, and repel each other.
  6. When we touch the disc with our hand, the leaves collapse because the charge in the leaves goes into the earth through our body, and the leaves get discharged.
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Question 21 Mark
Why do the leaves of a gold leaf electroscope fly apart when a charged body touches its disc?
Answer
The leaves of a gold leaf electroscope fly apart when a charged body touches its disc because like charges develop on both the leaves and hence they repel each other.
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Question 31 Mark
Why does the charge developed by induction disappear quickly?
Answer
The charge developed by induction disappears quickly because it is very weak.
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Question 41 Mark
Why is the charge developed due to friction called static electric charge?
Answer
The charge developed due to friction is called 1 static electric charge because the charge remains still on the object.
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