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Q.

Let H1 be the heat generated per second in the filament of 100 W, 250 V lamp and H, be that in filament of 200 W, 250 V lamp. Which of the following is correct ?

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a

H1 = 2H2

b

H1 = 4H2

c

2H1 = H2

d

4H1 = H2

answer is C.

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Detailed Solution

The resistance of 200 W lamp is half that of 100 W lamp. So, heat produced in 200 W lamp is twice that produced in 100 W lamp∴ 2H1=H2
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Let H1 be the heat generated per second in the filament of 100 W, 250 V lamp and H, be that in filament of 200 W, 250 V lamp. Which of the following is correct ?