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संबंधित प्रश्न
What is the function of a key (or switch) in an electric circuit?
Write symbol and state function of following component in an electric circuit :
ammeter
Explain why does a metal wire when connected to a cell offer resistance to the flow of current.
How is potential difference related to work done and quantity of charge?
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?
What is the other name of a variable resistor?
State three factors on which the resistance of a wire depends. Explain, how does the resistance depend on the factors stated by you.
