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प्रश्न
A wire of resistance 1 Ω is stretched to double its length. What will happen to the resistance of the stretched wire?
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उत्तर
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संबंधित प्रश्न
What is a secondary cell?
State three differences between the primary and secondary cells.
(a) Complete the circuit given in Fig. by inserting between the terminals A and C. an ammeter.
(b) In the diagram, mark the polarity at the terminals of ammeter and indicate clearly the direction of flow of current in the circuit when the circuit is complete.
(c) Name and state the purpose of Rh in the circuit.
Define electric potential in terms of energy spent.
What do you understand by the term electric current?
State the kind of charge on a negative ion.
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 do you mean by the potential difference? Write its SI unit.
