Assertion : A 60 W − 220 V bulb glows more than a 100 W − 220 V bulb when they are connected in series across a potential difference. Reason : When they are connected in series, resistance of 100 W bulb will be more.

Question

Assertion : A 60 W − 220 V bulb glows more than a 100 W − 220 V bulb when they are connected in series across a potential difference. Reason : When they are connected in series, resistance of 100 W bulb will be more., If both assertion and reason are true and reason is the correct explanation of assertion., If both assertion and reason are true but reason is not the correct explanation of assertion., If assertion is true but reason is false., If both assertion and reason are false.

MARKS App · Accepted Answer

As R ∝ P 1 ​ , resistance of 100 W bulb is less than that of 60 W bulb. Since resistance of 60 W is more, its filament produces more heat and glows more due to higher temperature. Resistance R is inversely proportional to wattage W , i.e., R ∝ 1/ W .

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