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प्रश्न
How is the resistance of a wire affected if its (a) length is doubled, (b) radius is doubled?
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उत्तर
(a) Resistance of a wire is directly proportional to the length of a wire; so if the length is doubled, resistance is also doubled.
(b) Resistance of a wire is inversely proportional to the area of cross-section the wire. Thus, if radius is doubled, area increases four times and hence the resistance becomes one-fourth.
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संबंधित प्रश्न
(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.
Name the physical quantity of which the unit is volt
What do you understand by the term quantity of electric charge?
How many electrons constitute one unit electric charge in SI system?
State the kind of charge on a positive ion.
State three factors on which the resistance of a wire depends. Explain, how does the resistance depend on the factors stated by you.
