What will happen to the resistance of the filament when the bulb glows?

Increases

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Decreases

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Remains same

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None of the above

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Solution

The correct option is A
Increases

When the electric current passes through the filament, it gets heated up and the light glows. As the temperature increases, the resistance also increases. For pure metals, resistance increases with increase in temperature but for elements like Carbon, Silicon etc resistance decreases with increase in temperature.

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