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  • Two electric bulbs, rated for the same voltage, have powers of 200 and , respectively.<b

Two electric bulbs, rated for the same voltage, have powers of 200 and 100 \mathrm{~W}, respectively.
If their resistances are \mathrm{r_1} and \mathrm{r_2}, respectively, then
 

Option: 1

\mathrm{r_1=2 r_2}


Option: 2

\mathrm{ r_2=2 r_1}


Option: 3

\mathrm{ r_2=4 r_1}


Option: 4

\mathrm{ r_1=4 r_2}


Answers (1)

best_answer

\mathrm{P=\frac{V^2}{R}, \frac{P_1}{R_2}=\frac{R_2}{R_1} \Rightarrow r_2=2 r_1}

Posted by

Gunjita

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