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प्रश्न
Define the term resistivity and state its S.I. unit. Which will have higher resistivity a conductor or an insulator.
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उत्तर
The resistivity of a substance is the resistance of a wire of that substance of unit length and unit area of cross-section. Its S. I. unit is ohm × m. An insulator will have higher resistivity.
संबंधित प्रश्न
Complete the following :-
(a)
Write any two characteristics of a series combination of resistors.
Find the equivalent resistance between points A and B.
Give one example to show how the resistance depends on the nature of material of the conductor.
Give the law of combination of resistances in series.
What potential difference is needed to drive a current o f 1 A through a 5 Ω resistor?
Choose the correct alternative and rewrite the following:
You are given three equal resistances. In how many combinations can they are arranged?
When do you say that the resistors are connected in this way? Draw a circuit diagram.
Why are thick copper wires used as connecting wires?
Write an expression for the resistance of a conducting wire in terms of its length and area of cross-section.
