MEDIUM
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IMPORTANT
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At very high frequencies, the effective impedance of the given circuit will be _________Ω.
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Important Questions on Electromagnetic Induction and Alternating Currents

EASY
JEE Main
IMPORTANT

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

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EASY
JEE Main
IMPORTANT

A square loop of side 20 cm and resistance 1 Ω is moved towards right with a constant speed v0. The right arm of the loop is in a uniform magnetic field of 5 T. The field is perpendicular to the plane of the loop and is going into it. The loop is connected to a network of resistors each of value 4Ω. What should be the value of v0 so that a steady current of 2 mA flows in the loop ?

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MEDIUM
JEE Main
IMPORTANT

The arm PQ of a rectangular conductor is moving from x=0 to x=2b outwards and then inwards from x=2b to x=0 as shown in the figure. A uniform magnetic field perpendicular to the plane is acting from x=0 to x=b. Identify the graph showing the variation of different quantities with distance:

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MEDIUM
JEE Main
IMPORTANT
In an LCR series circuit, an inductor 30 mH and a resistor 1 Ω are connected to an AC source of angular frequency 300 rad s-1. The value of capacitance for which the current leads the voltage by 45° is 1x×10-3 F. Then the value of x is
MEDIUM
JEE Main
IMPORTANT
For a series LCR circuit with R=100 Ω, L=0.5 mH and C=0.1 pF connected across 220 V-50 Hz AC supply, the phase angle between
current and supplied voltage and the nature of the circuit is:
MEDIUM
JEE Main
IMPORTANT
A series LCR circuit of R=5 Ω, L=20 mH and C=0.5 μF is connected across an AC supply of 250 V, having variable frequency. The power dissipated at resonance condition is ________×102 W.
EASY
JEE Main
IMPORTANT

In a circuit consisting of a capacitance and a generator with alternating emf, Eg=Egosinωt, VC and IC are the voltage and current. Correct phasor diagram for such circuit is

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MEDIUM
JEE Main
IMPORTANT

Match List-I with List-II.

  List - I   List - II
(a) ωL>1ωC (i) Current is in phase with emf
(b) ωL=1ωC (ii) Current lags behind the applied emf
(c) ωL<1ωC (iii) Maximum current occurs
(d) Resonant frequency (iv) Current leads the emf

Choose the correct answer from the options given below.