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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
Why is the series arrangement not used for domestic circuits?
Find the equivalent resistance between points A and B
Find the equivalent resistance between A and B
Name the material which is the best conductor of electricity.
How does the resistance of a pure metal change if its temperature decreases?
How does the resistance of a wire change when:
its length is tripled?
A p.d. of 4 V is applied to two resistors of 6 Ω and 2 Ω connected in series. Calculate:
(a) the combined resistance
(b) the current flowing
(c) the p.d. across the 6 Ω resistor
A graph is plotted taking p.d. along y-axis and electric current along x-axis. Name the physical quantity that represents the slope of this graph (Fig.).
Calculate the equivalent resistance between the points A and B for the following combination of resistors:
