New chat PYQ Library Doubts Rank report

Sign in to see Recents

Sign in to save progress →

Electromagnetic Waves question

2022 · 24 Jun · Shift 2 · Q61

Guest · try one question or challengeGuest · try one question or challenge

PYQ Library
JEE Main
Physics
Electromagnetic Waves
2022 · 24 Jun · Shift 2 · Q61

Electromagnetic Waves question

2022 · 24 Jun · Shift 2 · Q61

JEE MainPhysicsElectromagnetic WavesMCQ+4 / −1

An electric bulb is rated as 200 W. What will be the peak magnetic field at 4 m distance produced by the radiations coming from this bulb? Consider this bulb as a point source with 3.5% efficiency.

A
1.19 $\times$ 10 $-$ 8T
B
1.71 $\times$ 10 $-$ 8T
C
0.84 $\times$ 10 $-$ 8T
D
3.36 $\times$ 10 $-$ 8T

More from Electromagnetic Waves

The rms value of conduction current in a parallel plate capacitor is $6.9 μ A$ . The capacity of this capacitor, if it is connected to $230 V$ ac supply with an angular frequency of $600 rad / s$ ,…2022 · MCQ
Light wave travelling in air along x-direction is given by $E_{y} = 540 sin π \times 1 0^{4} (x - c t) V m^{- 1}$ . Then, the peak value of magnetic field of wave will be (Given c = 3 $\times$ 108 ms $-$ 1)2022 · MCQ
The electric field in an electromagnetic wave is given by E = 56.5 sin $ω$ (t $-$ x/c) NC $-$ 1. Find the intensity of the wave if it is propagating along x-axis in the free space. (Given : $ε$ 0 = 8.85 $\times$ 10 $-$ 12C2N $-$ …2022 · MCQ
The electromagnetic waves travel in a medium at a speed of 2.0 $\times$ 108 m/s. The relative permeability of the medium is 1.0. The relative permittivity of the medium will be :2022 · MCQ
The magnetic field of a plane electromagnetic wave is given by : $B = 2 \times 1 0^{- 8} sin (0.5 \times 1 0^{3} x + 1.5 \times 1 0^{11} t) \hat{j} T$ . The amplitude of the electric…2022 · MCQ
The oscillating magnetic field in a plane electromagnetic wave is given by $B_{y} = 5 \times 1 0^{- 6} sin 1000 π (5 x - 4 \times 1 0^{8} t) T$ . The amplitude of electric field will be :2022 · MCQ
A velocity selector consists of electric field $E = E \hat{k}$ and magnetic field $B = B \hat{j}$ with $B = 12 m T$ . The value of $E$ required for an electron of energy $728 e V$ moving along the positive $x$ -axis to…2022 · MCQ
If Electric field intensity of a uniform plane electromagnetic wave is given as $E = - 301.6 sin (k z - ω t) a_{x} + 452.4 sin (k z - ω t) a_{y} \frac{V}{m}$ . Then magnetic intensity 'H' of this wave in Am $-$ 1…2022 · MCQ