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Simple replace the resistor with capacitors and ohms to micro farad and calculate total capacitance |
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Answer» Answer: You have limited ACCESS to toppr answr. Sign to unlock 35 lakh questions What's your doubt? Physics Bookmark A resistor R and 2 μF capacitor in series is connected through a SWITCH to 200 v direct SUPPLY. ACROSS the capacitor is a neon BULB that lights up at 120 V. Find the value of R to make the bulb light up 5 s after the switch has been closed. (log 10
2.5=0.4)
share Share Answer Correct option is C 2.7×10 6 Ω V c
=200(1−e −t/τ ) 120=200(1−e −t/τ ) e −t/τ = 200 200−120
= 200 80
+ τ t
=log e
(2.5)= 0.43 0.4
=0.92 τ=RC ⇒R= 0.92×2×10 −6
5
⇒R=2.71×10 6 Ω |
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