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2 nd Year : Unit 2.1 ( Current Electricity ) - Current Electricity

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A flash light lamp is marked 3.5V and 0.28A. The filament temperature is 425⁰C. The filament resistance of 0⁰C is 4Ω . Then, the temperature coefficient of resistance of the material of the filament is:

A. 8.5 × 10^-3 / K

B. 3.5 × 10^-3 / K

C. 0.5 × 10^-3 / K

D. 5 × 10^-3 / K

E. None of the above

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Correct choice: D

Explanation:

None

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Eamcet Physics 2 nd Year : Unit 2.1 ( Current Electricity ) - Current Electricity

Eamcet Physics
2 nd Year : Unit 2.1 ( Current Electricity ) - Current Electricity