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प्रश्न
Which among iron and mercury is a better conductor of electricity?
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उत्तर
Iron is a better conductor of electricity than mercury because the resistivity of iron is less than that of mercury.
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संबंधित प्रश्न
On what factors does the resistance of a conductor depend?
List the factors on which the resistance of a conductor in the shape of a wire depends.
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What is meant by the "resistance of a conductor" ? Write the relation between resistance, potential difference and current.
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Give two examples of substances which are good conductors of electricity. Why do you think they are good conductors of electricity?
Calculate the resistance of a copper wire 1.0 km long and 0.50 mm diameter if the resistivity of copper is 1.7 × 10−8 Ω m.
How does the resistance of a conductor depend on:
temperature of the conductor?
What would be the effect on the resistance of a metal wire of:
increasing its diameter?
What would be the effect on the resistance of a metal wire of:
increasing its temperature?
Calculate the area of cross-section of a wire if its length is 1.0 m, its resistance is 23 Ω and the resistivity of the material of the wire is 1.84 × 10−6 Ω m.
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Plastic insulation surrounds a wire having diameter d and length l as shown above. A decrease in the resistance of the wire would be produced by an increase in the ______.
How will the resistance of a wire be affected if its
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- radius is also doubled ?
Give justification for your answer.
