A) 40 W bulb glows brightest
B) 60 W bulb glows brightest
C) 100 W bulb glows brightest
D) All bulbs glow with same brightness
Correct Answer: A
Solution :
Current through each bulb is same because these are connected in series. since \[\left( R=\frac{{{V}^{2}}}{P} \right)\], resistance of 40 W bulb is more, hence greater heat is produced in the 40 W bulb, it glows brightest \[H={{I}^{2}}Rt\]
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