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Q.

60 W, 100 W and 1000 W bulbs are connected in parallel to the mains. The bulb that will be brightest is (all of them have same specified voltage)

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a

100W

b

all are equally bright

c

1000W

d

60W

answer is C.

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Detailed Solution

For a parallel connection, power consumption is 

P= V2RP1R

For the given bulbs, R can be calculated by 

R = V2PratedR1Prated

Therefore, the 1000W bulb will be the brightest.

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