CapacitanceHard
Question
A resistor ′R′ and 2μF 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. Calculate the value of R to make the bulb light up 5 s after the switch has been closed. (log10 2.5 = 0.4)
Options
A.1.7 × 105 Ω
B.2.7 × 106 Ω
C.3.3 × 107 Ω
D.1.3 × 104 Ω
Solution
Vc = E( 1 - e- t/Rc)
1 - e- t/Rc =
2.7 × 106 Ω
1 - e- t/Rc =
2.7 × 106 ΩCreate a free account to view solution
View Solution FreeMore Capacitance Questions
A series combination of n1 capacitors, each of value C1 is charge by a source of potential difference 4V. When another p...When the key is pressed at time t = 0 then which of the following statement about the current i in the resistor AB of th...A parallel plate capacitor of capacitance 90 pF is connected to a battery of emf 20V. If a dielectric material of dielec...In the adjoining diagram, (assuming the battery to be ideal) the condenser C will be fully charged to potential V if -...How the seven condensers, each of capacity 2μF, should be connected in order to obtain a resultant capacitance of 1...