Assertion :A $60 W$ bulb is connected in parallel with a room heater and this combination is connected across the mains. If the $60 W$ bulb is replaced by a $100 W$ bulb, the heat produced by the heater will be more . BECAUSE Reason: When resistances are connected in parallel across the mains, the heat produced is inversely proportional to the resistance

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is D Assertion is incorrect but Reason is correct
In parallel connections voltages in all branches are same and so change in bulb will not effect heat produced in heater so assertion is incorrect.

Power = $\frac{V^{2}}{R}$ Power is inversely proportional to Resistance so reason is correct.

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