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Two balbs consume same power when operated at 200V and 300V respectively. When these bulbs are connected in series across a. d. c. source of 500 volt, than
Given that both bulbs consume the same power at 200V and 300V, their
resistances are R₁ = 200²/p and R₂ = 300²/p , so R₁/R₂ = 4/9. Since in series, V₁/V₂ = R₁/R₂, the correct answer is (b) Ratio of potential difference across them is 4/9.
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