Incandescent bulbs are designed by keeping in mind that the resistance of their filament…
Physics · NEET · NTA Exams — Current Electricity
Incandescent bulbs are designed by keeping in mind that the resistance of their filament increases with the increase in temperature. If at room temperature, 100W, 60W and 40W bulbs have filament resistance R100, R60 and R40, respectively, the relation between these resistances is
- \(\frac{1}{R_{10}}=\frac{1}{R_{4!}}+\frac{1}{R_{6!}}\)
- R100 = R40 + R60
- R100 > R60 > R40
- \(\frac{1}{R_{10}}>\frac{1}{R_{60}}>\frac{1}{R_{40}}\)
Answer
(C) R 100 > R 60 > R 40
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