Two electric bulbs have tungsten filament of same length. If one of them gives 60 watt and other 100 watt, then
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a
100 watt bulb has thicker filament
b
60 watt bulb has thicker filament
c
both filaments are of same thickness
d
it is impossible to get different wattage unless the lengths are different
answer is A.
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Detailed Solution
R∝1PHence resistance of 60 watt bulb will be more than resistance of 100 watt bulbFurther R=ρ1πr2 or R∝1r2So, the radius of 1o0 watt bulb will be more than 60 watt bulb, Hence 100 watt bulb has thicker filament.