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Question

A circuit has a fuse of 5A What is the maximum number of 60W (220V) lamps that can be safety used in the circuit?

A
12
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B
18
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C
44
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D
300
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Solution

The correct option is B 18
Let all the n bulbs be connected in parallel. Hence the current through the fuse equally divides in all the bulbs, equaling 5nA.
Hence for the safe working
Ibulb<Ilimit
PV<5n
n<18.33
nmax=18

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