EASY
JEE Main
IMPORTANT
Earn 100

Given below are two statements :
Statement-I: The reactance of an AC circuit is zero. It is possible that the circuit contains a capacitor and an inductor.
Statement-II: In AC circuit, the average power delivered by the source never becomes zero.
In the light of the above statements, choose the correct answer from the options given below

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Important Questions on Electromagnetic Induction and Alternating Currents

EASY
JEE Main
IMPORTANT
A circular coil of 1000 turns each with area 1 m2 is rotated about its vertical diameter at the rate of one revolution per second in a uniform horizontal magnetic field of 0.07 T. The maximum voltage generation will be _____ V.
EASY
JEE Main
IMPORTANT

Match List - I with List - II.

  List-I   List-II
(A) AC generator (I) Detects the presence of current in the circuit
(B) Galvanometer (II) Converts mechanical energy into electrical energy
(C) Transformer (III) Works on the principle of resonance in AC circuit
(D) Metal detector (IV) Changes an alternating voltage for smaller or greater value
HARD
JEE Main
IMPORTANT
The current in a coil of self inductance L=2.0 H is increasing according to the law i=2sint2. Find the amount of energy spent (in J) during the period when the current changes from 0 to 2 A.
MEDIUM
JEE Main
IMPORTANT
A sinusoidal voltage Vt=210sin3000t volt is applied to a series LCR circuit in which L=10 mH,C=25 μF and R=100Ω. The phase difference Φ between the applied voltage and resultant current will be 
EASY
JEE Main
IMPORTANT

In a series LCR circuit, the inductance, capacitance and resistance are L=100 mH, C=100 μFand R=10 Ω respectively. They are connected to an AC source of voltage 220 V and frequency of 50 Hz. The approximate value of current in the circuit will be _____ A.

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MEDIUM
JEE Main
IMPORTANT

Two coils of self inductance L1 and L2 are connected in series combination having mutual inductance of the coils as M. The equivalent self inductance of the combination will be

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EASY
JEE Main
IMPORTANT
A metallic conductor of length 1 m rotates in a vertical plane parallel to east-west direction about one of its end with angular velocity 5 rad s-1. If the horizontal component of earth's magnetic field is 0.2×10-4 T, then emf induced between the two ends of the conductor is