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Q.

A factory is served by a 220 V supply line. In a circuit protected by a fuse marked 10 A, the maximum number of 100 W lamps in parallel that can be turned on, is

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a

11

b

66

c

22

d

33

answer is B.

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Detailed Solution

Current required by each bulb,

i=PV=100220A

If n bulbs are joined in parallel, then ni = ifuse

or    n×100220=10  or   n=22

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