Describe an experiment to show that the like charges repel each other while the unlike charges attract.
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Sometimes when you take off your nylon clothes, your hair stands on their end. Explain the observation.
[8.1] Electricity
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The charge on a body is -1.8e. Is this statement true?
[8.1] Electricity
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Draw a labeled diagram of a gold-leaf electroscope.
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What is the purpose of an electroscope?
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What do you mean by an electric current?
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The following Figure represents a negatively charged gold Ieaf electroscope. Label the parts, P, Q, and R and the estate whether each is an insulator or a conductor. Also, indicate the distribution of charges on the system in the diagram.
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What is meant by the earthing of an electroscope?
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Write SI unit of
Electric current,
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The following figure shows a metal rod PQ mounted on an insulated stand. The cap of an uncharged electroscope touches one end Q of the metal rod. A negatively charged ebonite rod is brought near the other end P of the metal rod.
(a) What charge does the end P have?
(b) What charge does the end Q have?
(c) What charge does the cap of the electroscope have?
(d) What charge does the gold leaf have?
(e) Will the leaf diverge or collapse? Give reason.
(f) If the electroscope is now earthed, what charge does the metal rod have?
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Write SI unit of
Potential difference
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Write SI unit of
Resistance.
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What are the two kinds of charges?
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What is the net charge on an atom?
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How many electrons are present in Na+? The atomic number of Na is 11.
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Distinguish between an atom and an ion.
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What causes the electrification of two bodies when they are rubbed together?
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The lighting and the thunder are produced simultaneously, but the sound of the thunder is heard a few seconds after the lightning is seen. Why?
[8.1] Electricity
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What is the purpose of an electroscope?
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A positively charged rod is brought near the cap of a positively charged gold leaf electroscope. State your observation and give a reason.
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