1
JEE Advanced 2017 Paper 2 Offline
MCQ (More than One Correct Answer)
+4
-2
A source of constant voltage V is connected to a resistance R and two ideal inductors L1 and L2 through a switch S as shown. There is no mutual inductance between the two inductors. The switch S is initially open. At t = 0, the switch is closed and current begins to flow. Which of the following options is/are correct?

A
After a long time, the current through L1 will be $${V \over R}{{{L_2}} \over {{L_1} + {L_2}}}$$
B
After a long time, the current through L2 will be $${V \over R}{{{L_1}} \over {{L_1} + {L_2}}}$$
C
The ratio of the currents through L1 and L2 is fixed at all times (t > 0)
D
At t = 0, the current through the resistance R is $${V \over R}$$
2
JEE Advanced 2017 Paper 1 Offline
MCQ (More than One Correct Answer)
+4
-1
In the circuit shown, $$L = 1\,\mu H,C = 1\,\mu F\,$$ and $$R = 1\,k\Omega .$$ They are connected in series with an a.c. source $$V = {V_0}\sin \omega t$$ as shown.

Which of the following options is/are correct?

A
The current will be in phase with the voltage if $$\omega = {10^4}$$ $$rad.{s^{ - 1}}$$
B
The frequency at which the current will be in phase with the voltage is independent of $$R$$
C
At $$\omega \sim 0$$ the current flowing through the circuit becomes nearly zero
D
At $$\omega > > {10^6}rad.{s^{ - 1}},$$ the circuit behaves like a capacitor
3
JEE Advanced 2014 Paper 1 Offline
MCQ (More than One Correct Answer)
+4
-1
At time t = 0, terminal A in the circuit shown in the figure is connected to B by a key and an alternating current I(t) = I0 cos ($$\omega$$t), with I0 = 1 A and $$\omega$$ = 500 rad s-1 starts flowing in it with the initial direction shown in the figure. At $$t = {{7\pi } \over {6\omega }}$$, the key is switched from B to D. Now onwards only A and D are connected. A total charge Q flows from the battery to charge the capacitor fully. If C = 20 $$\mu$$F, R = 10 $$\Omega$$ and the battery is ideal with emf of 50 V, identify the correct statement(s).

A
Magnitude of the maximum charge on the capacitor before $$t = {{7\pi } \over {6\omega }}$$ is 1 $$\times$$ 10$$-$$3 C
B
The current in the left part of the circuit just before $$t = {{7\pi } \over {6\omega }}$$ is clockwise
C
Immediately after A is connected to D, the current in R is 10 A
D
Q = 2 $$\times$$ 10$$-$$3 C
4
IIT-JEE 2012 Paper 2 Offline
MCQ (More than One Correct Answer)
+4
-2

In the given circuit, the AC source has $$\omega$$ = 100 rad/s. Considering the inductor and capacitor to be ideal, the correct choice(s) is(are)

A
The current through the circuit, I is 0.3 A.
B
The current through the circuit, I is 0.3$$\sqrt2$$ A.
C
The voltage across 100 $$\Omega$$ resistor = 10$$\sqrt2$$ V.
D
The voltage across 50 $$\Omega$$ resistor = 10 V.
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