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Two resistance R1 and R2 when connected in series consume power 25 W. When connected in parallel, they consume 100 W. What is the ratio of the power of each?

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a

1/4

b

1/3

c

1/2

d

1

answer is D.

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Detailed Solution

Let W1 and W2 be the power of two resistances. Then, W1+W2=100 and W1w2 W1+W2=25⇒W1 W2=2500On solving, we get W1=W2=50.∴W1/W2=1

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Two resistance R1 and R2 when connected in series consume power 25 W. When connected in parallel, they consume 100 W. What is the ratio of the power of each?