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Two wires have the same length, same rad...

Two wires have the same length, same radius but one of them is made of copper and the other is made of iron. Which Will have more resistance?

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As resistance `R = rho l/A` and resistivity `rho` for iron is more than that for copper, the iron wire will have more resistance.
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KUMAR PRAKASHAN-ELECTRICITY-OBJECTIVE QUESTIONS AND ANSWERS (Answer the following questions as directed (Miscellaneous):)
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  2. How is heat produced in a conductor by an electric current?

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  4. Which bulb will glow With maximum brightness in case bulbs of differen...

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  5. What can you say about the resistance of an ammeter?

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  6. What can you say about the resistance of a voltmeter?

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  7. How does the resistance of a metallic Wire depend on its temperature?

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  8. Two wires have the same length, same radius but one of them is made of...

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  9. Name a substance whose resistance decreases with temperature.

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  10. Name a substance whose resistance almost remains unchanged With a chan...

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  11. Distinguish between the kilowatt and the kilowatt hour.

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  12. Name two characteristics of a heater coil.

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  13. The power-voltage rating of an electric appliance is 100 W- 250 V What...

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  14. Why is much less heat generated in long electric cables than in the fi...

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  15. How much energy is consumed by 2 kW AC when used for 2 hour?

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  16. A wire of resistivity p is pulled to double its length. What will be i...

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  17. How does the resistance of an ohmic conductor depend on the applied v...

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  18. What causes the potential difference between the two terminals of a ce...

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  19. Name and define the smallest commercial unit of electricity.

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  20. If, the current I, through a resistor is increased by 100.% (assume th...

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