HARD
Earn 100

Consider the L-R circuit shown below and choose the correct statement(s).

Question Image

50% studentsanswered this correctly

Important Questions on Electromagnetic Induction

MEDIUM

In the figure shown, a circuit contains two identical resistors with resistance R=5Ω and an inductance with L=2mH. An ideal battery of 15V is connected in the circuit. What will be the current through the battery long after the switch is closed?

Question Image

HARD

An inductor (L=0.03H) and a resistor (R=0.15 ) are connected in series to a battery of 15V E.M.F. in a circuit shown below. The key K1 has been kept closed for a long time. Then at t=0, K1 is opened and key K2 is closed simultaneously. At t=1ms , the current in the circuit will be : Take, e5150

Question Image 

HARD

Question Image
As shown in the figure, a battery of emf is connected to an inductor L and resistance R in series. The switch is closed at t=0. The total charge that flows from the battery, between t=0 and t=τ ( τ is the time constant of the circuit) is:

MEDIUM
An emf of 15 V is applied to a circuit containing 5 H inductance and 10 Ω resistance. The ratio of currents at time t= and t=1 s after closing the switch is:
HARD
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?

Question Image
EASY

A part of a complete circuit is shown in the figure. At some instant, the value of current I is 1A and it is decreasing at a rate of 102As-1. The value of the potential difference Vp-VQ, (in volts) at that instant is-

Question Image  

HARD
A coil of self inductance 10 mH and resistance of 0.1 Ω is connected through a switch to a battery of internal resistance  0.9 Ω . After the switch is closed, the time taken for the current to attain 80% of the saturation value is:  [ ln5=1.6 ]
EASY
An inductor of 10 mH is connected to a 20 V battery through a resistor of 10  and a switch. After a long time, when maximum current is set up in the circuit, the current is switched off. The current in the circuit after 1 μs is x100 mA. Then x is equal to ______ . (Take e-1=0.37)
HARD
In the figure below, the switches S1 and S2 are closed simultaneously at t = 0 and a current starts to flow in the circuit. Both the batteries have the same magnitude of the electromotive force (emf) and the polarities are as indicated in the figure. Ignore mutual inductance between the inductors. The current I in the middle wire reaches its maximum magnitude Imax time t =τ. Which of the following statements is (are) true?

Question Image
HARD

A 20 H inductor coil is connected to a 10 Ω resistance in series as shown in figure. The time at which rate of dissipation of energy (Joule's heat) across resistance is equal to the rate at which magnetic energy is stored in the inductor, is:
Question Image

MEDIUM

Question Image

When a DC voltage is applied at the two ends of a circuit kept in a closed box, it is observed that the current gradually increases from zero to a certain value and then remains constant. What do you think that the circuit contains?

EASY

Figure shows a circuit contains three identical resistors with resistance R=9.0 Ω each, two identical inductors with inductance L=2.0  mH each, and an ideal battery with emf ε= 18 V. The current i through the battery just after the switch closed is:

Question Image

EASY

The figure shows a circuit that contains four identical resistors with resistance R=2.0 Ω, two identical inductors with inductance L=2.0 mH and an ideal battery with E.M.F. E=9 V. The current i just after the switch S is closed will be:

Question Image

MEDIUM
An emf of 20 V is applied at time t=0 to a circuit containing in series 10 mH inductor and 5 Ω resistor. The ratio of the currents at time t= and at t=40 s is close to: (Take e2=7.389 )
HARD

The current (i) at time t=0 and t= respectively for the given circuit is :

Question Image

MEDIUM
An inductor coil stores 64 J of magnetic field energy and dissipates energy at the rate of 640 W when a current of 8 A is passed through it. If this coil is joined across an ideal battery, find the time constant of the circuit (in s).
 
EASY

For the given circuit the current i through the battery when the key in closed and the steady state has been reached is

Question Image

HARD
Consider the LR circuit shown in the figure. If the switch S is closed at t=0 then the amount of charge that passes through the battery between t=0 and t=LR is:
Question Image
MEDIUM
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. Ratio of the voltage across resistance and the inductor at t=LR will be equal to :

          Question Image
HARD

In the circuit shown below, all the inductors (assumed ideal) and resistors are identical. The current through the resistance on the right is I after the key K has been switched on for along time. The currents through the three resistors (in order, from left to right) immediately after the key is switched off are-

Question Image