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  • The electric bulbs have tungsten filaments of same length. If one of them gives 60 watts and the other 100 watts then :  Option: 1 1

The electric bulbs have tungsten filaments of same length. If one of them gives 60 watts and the other 100 watts then :
 

Option: 1

100 watts bulb has thicker filament
 


Option: 2

 60 watts bulb has thicker filament
 


Option: 3

 both filaments are of same thickness
 


Option: 4

 it is possible to get different wattage unless the lengths are different.

 


Answers (1)

\begin{aligned} & \mathrm{R}_{\mathrm{B}} \propto \frac{1}{\mathrm{Power}} \Rightarrow \mathrm{R}_{60 \mathrm{~W}}>\mathrm{R}_{100 \mathrm{~W}} \\ & \because \mathrm{R}=\frac{\rho \ell}{\mathrm{A}} \Rightarrow \mathrm{A}_{60} \mathrm{~W}<\mathrm{A}_{100} \mathrm{~W} \end{aligned}

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Kshitij

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