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When a 500-W electric and a 500-W heater...

When a `500-W` electric and a `500-W` heater operate at their rates voltages, the filament of the bulb reaches a much higher temperature than the filament of the heater. The most important reason for this that

A

Their resistances are not equal

B

They are made of different materials

C

Their dimensions are very different

D

The emissivity of their surface is different

Text Solution

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The correct Answer is:
C
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RESNICK AND HALLIDAY-CURRENT AND RESISTANCE-Practice Questions (Single Corret Choice Type)
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  4. A conductor of area of cross-section. A having charge carries, each ha...

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  10. When a 500-W electric and a 500-W heater operate at their rates voltag...

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  11. The charge flowing in a conductor varies with times as Q = at - bt^2. ...

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  12. E denotes electric field in a uniform conductor, I corresponding curre...

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  13. A voltmeter and an ammeter are joined, in series to an ideal cell, giv...

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  14. A current passes through a wire of nonuniform cross-section. Which of ...

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  15. A uniform wire of resistance R is slaped into a regular n-sided polygo...

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  16. A copper strip AB and an iron strip AC are joined at A. The junction A...

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  17. When no current is passed through a conductor,

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  18. Which of the following statements is/are correct?

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  19. Which one of the following statements is false?

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  20. Which of the following statements are true for a metallic conductor ?

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