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The resistance of a bulb filament is 100Ω at a temperature of 100°C. If its temperature coefficient of resistance is 0.005 per °C,

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The resistance of a bulb filament is 100Ω at a temperature of 100°C. If its temperature coefficient of resistance is 0.005 per °C, its resistance will become 200Ω at a temperature of

(a) 300°C (b) 400°C (c) 500°C (d) 200°C

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Correct Option(b) 400°C

Explanation:

Let resistance of bulb filament be Ro at 0°C, then from the expression,

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