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Q.

A resistor R1 dissipates the power P when connected to a certain generator. If the resistor R2 is put in series with R1, the power dissipated by R1

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a

decreases

b

increases

c

remains the same

d

any of the above depending upon the relative values of R1 and R2

answer is A.

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Detailed Solution

Equivalent resistance in the second case = R1 + R2 = RNow, we know that P ∝1RSince in the second case the resistance (R1 + R2) is higher than that in the first case (R1), therefore power dissipation in the second case will be decreased.
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A resistor R1 dissipates the power P when connected to a certain generator. If the resistor R2 is put in series with R1, the power dissipated by R1