A resistor 'R' and `2(mu)F` capacitor in series is connected through a switch to 200 V direct supply. A cross 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. (`log_(10) 2.5 = 0.4`)

A resistor R and 2muF capacitor in series are connected to a 220V dc supply. Across the capacitor is a neon bulb that strikes at 120V. Calculate the value of R to make the bulb strike 5s after the switch has been closed.

An electric bulb with rating 200 W, 50V is connected to a source of 120 V. A resistance R is connected in series to the bulb, so that the bulb delivers 200W . Calculate the value of R.

An inductor of 5 m H is connected in series with a resistor of resistance 4 Omega . A battery of 2 V is connected across the circuit through a switch . Calculate the rate of growth of current just after the switch is on .

Four capacitors of capacitance 10muF and a battery of 200V are arranged as shown. How much charge will flow through AB after the switch S is closed :

Figure shows an inductor L and a resistor R connected in parallel to a battery through a switch. The resistance R is the same as that of the coil L. Two identical bulbs are put in each arm of the circuit? (i) Which of the bulb lights up earlier when switch S is closed? (ii) Will the bulbs be equally bright after some time?

In the connection shown in the figure, initially the switch K is open and the capacitor is uncharged. Then the switch is closed, and the capacitor is charged up to the steady state and the switch is opened again. Determine the values indicated by the values indicated by the ammeter just after closing the switch [Given V_0 = 30 V, R_1 = 10k Omega, R_2 = 5kOmega ] . A long time after switch was closed.