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प्रश्न
Choose the correct alternative:
Alloys of metals usually have (greater/less) resistivity than that of their constituent metals.
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उत्तर
Alloys of metals usually have greater resistivity than that of their constituent metals.
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संबंधित प्रश्न
A heating element is marked 210 V, 630 W. Find the resistance of the element when connected to a 210 V dc source.
Two wires of equal length, one of copper and the other of manganin have the same resistance. Which wire is thicker?
A uniform wire of resistance 100 Ω is melted and recast as a wire whose length is double that of the original. What would be the resistance of the wire?
What length of a copper wire of cross-sectional area 0.01 mm2 will be needed to prepare a resistance of 1 kΩ? Resistivity of copper = 1.7 × 10–8 Ωm
How does the resistivity of a semiconductor change with rise of temperature ? Explain.
Choose the correct alternative:
Alloys usually have much (lower/higher) temperature coefficients of resistance than pure metals.
Choose the correct alternative:
The resistivity of the alloy manganin is nearly independent of/increases rapidly with increase of temperature.
Choose the correct alternative:
The resistivity of a typical insulator (e.g., amber) is greater than that of a metal by a factor of the order of (1022/1023).
Fuse wire should have
Which of the following describes the temperature dependence of semiconductors?
Which pair of materials best exemplifies semiconductors?
What is the primary reason copper is used in household wiring?
How does the resistivity of semiconductors compare to that of conductors and insulators?
What is approximately how many times greater is the resistivity of insulators compared to metals?
