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Class XII Physics Alternating Current 2
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Question 1
The ratio of time constant in charging and discharging in the circuit shown in figure is
Question 2
A circuit has a resistance of 12 Ω and an impedance of 15 Ω. The power factor of the circuit will be
Question 3
The phase difference between the alternating current and emf is π/2. Which of the following cannot be the constituent of the circuit?
Question 4
An inductor of inductance L = 400 mH and resistors of resistances R1 = 2 Ω and R2 = 2 Ω are connected to a battery of emf 12 V as shown in the figure. The internal resistance of the battery is negligible. The switch S is closed at t = 0. The potential drop across L as a function of time is :
Question 5
In an LCR series a.c. circuit, the voltage across each of the components, L, C and R is 50 V. The voltage across the LC combination will be
Question 6
An inductor (L = 0.03 H) and a resistor (R = 0.15 kΩ) are connected in series to a battery of 15 V EMF in a circuit shown below. The key K 1 has been kept closed for a long time. Then at t = 0, K1 is opened and key K2 is closed simultaneously. At t = 1 ms, the current in the circuit will be : 
Question 7
In the circuit shown here, the point C is kept connected to point ‘A’ till the current flowing through the circuit becomes constant. Afterward, suddenly, point ‘C’ is disconnected from point 'A’ and connected to point B at time t = 0. The ratio of the voltage across resistance and the inductor at t = L/R will be equal to
Question 8
A resistor R and 2μF capacitor in series in 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 make the bulb light up 5 s after the switch has been closed (log10 2.5 = 0.4)
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Mar 27JEE & BITSAT
