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Conductivity and Resistivity

What is the m...

Question

What is the minimum number of bulbs, each marked 60 W, 40 V, that can work safely when connected in series with a 240 V mains supply ?

A

2

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B

4

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C

6

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D

8

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Solution

The correct option is B 6
In series, voltage gets distributed equally amongst identical resistances.
$Number of bulbs = \frac{total voltage}{rated voltage of each}$
$= \frac{240}{40} = 6$

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