JEE Main 2021 (Online) 27th August Morning Shift | Alternating Current and Electromagnetic Induction Question 92 | Physics

JEE Main 2021 (Online) 27th August Morning Shift

MCQ (Single Correct Answer)

-1

Electric field in a plane electromagnetic wave is given by E = 50 sin(500x $$-$$ 10 $$\times$$ 10¹⁰ t) V/m The velocity of electromagnetic wave in this medium is :

(Given C = speed of light in vacuum)

$${3 \over 2}$$C

$${2 \over 3}$$C

$${C \over 2}$$

JEE Main 2021 (Online) 26th August Evening Shift

MCQ (Single Correct Answer)

-1

In the given circuit the AC source has $$\omega$$ = 100 rad s^-1. Considering the inductor and capacitor to be ideal, what will be the current I flowing through the circuit?

JEE Main 2021 (Online) 26th August Evening Shift Physics - Alternating Current and Electromagnetic Induction Question 94 English

JEE Main 2021 (Online) 26th August Evening Shift Physics - Alternating Current and Electromagnetic Induction Question 94 English

5.9 A

3.16 A

0.94 A

6 A

JEE Main 2021 (Online) 26th August Morning Shift

MCQ (Single Correct Answer)

-1

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

0.4

0.8

0.125

0.2

JEE Main 2021 (Online) 26th August Morning Shift

MCQ (Single Correct Answer)

-1

A series LCR circuit driven by 300 V at a frequency of 50 Hz contains a resistance R = 3 k$$\Omega$$, an inductor of inductive reactance X_L = 250 $$\pi$$$$\Omega$$ and an unknown capacitor. The value of capacitance to maximize the average power should be : (Take $$\pi$$² = 10)

4 $$\mu$$F

25 $$\mu$$F

400 $$\mu$$F

40 $$\mu$$F

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