EASY
JEE Advanced
IMPORTANT
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The current in an L-R circuit builds upto 34th of its steady state value in 4 s. The time constant of this circuit is

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Important Questions on Electromagnetic Induction

MEDIUM
JEE Advanced
IMPORTANT

Some magnetic flux is changed from a coil of resistance 10 Ω. As a result an induced current is developed in it, which varies with time as shown in figure. The magnitude of change in flux through the coil in Wb is

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EASY
JEE Advanced
IMPORTANT

The current i in an induction coil varies with time t according to the graph shown

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in figure. Which of the following graphs shows the induced emfE in the coil with time?

MEDIUM
JEE Advanced
IMPORTANT

Switch S of the circuit shown in figure is closed at t=0. If e denotes the induced emf in L and i, the current flowing through the circuit at time t, which of the following graphs is correct?

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HARD
JEE Advanced
IMPORTANT
A coil of inductance L=50 μH and resistance =0.5 Ω is connected to a battery of emf=5 V. A resistance of 10 Ω is connected parallel to the coil. Now at some instant the connection of the battery is switched off. Then, the amount of heat generated in the coil after switching off the battery is
EASY
JEE Advanced
IMPORTANT
A pair of coils of turns n1 and n2 are kept close together. Current passing through the first is reduced at rate r, and emf 3 mV is developed across the other coil. If the second coil carries current which is then reduced at the rate 2r, the emf produced across the first coil will be
MEDIUM
JEE Advanced
IMPORTANT
An L-C circuit contains a 0.60 H inductor and a 25 μF capacitor. What is the rate of change of the current (in A s-1), when the charge on the capacitor is 3.0×10-5 C?
MEDIUM
JEE Advanced
IMPORTANT

A capacitor of capacity 2 μF is charged to a potential difference of 12 V. It is then connected across an inductor of inductance 0.6 mH. The current in the circuit at a time, when the potential difference across the capacitor is 6 V

MEDIUM
JEE Advanced
IMPORTANT

In the circuit shown, the coil has inductance and resistance. When X is joined to Y, the time constant is τ during growth of current. When the steady state is reached, heat is produced in the coil at a rate P. X is now joined to Z,

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