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Question 19

A resistor $$R$$ and $$2 \mu \text{F}$$ capacitor in series is connected through a switch to $$200 \, \text{V}$$ direct supply. Across the capacitor is a neon bulb that lights up at $$120 \, \text{V}$$. Calculate the value of $$R$$ to make the bulb light up $$5 \, \text{s}$$ after the switch has been closed. ($$\log_{10} 2.5 = 0.4$$)

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