JEE Main 2022 (Online) 25th June Morning Shift | Electromagnetic Waves Question 65 | Physics

The electric field in an electromagnetic wave is given by E = 56.5 sin $$\omega$$(t $$-$$ x/c) NC^$$-$$1. Find the intensity of the wave if it is propagating along x-axis in the free space.

(Given : $$\varepsilon $$₀ = 8.85 $$\times$$ 10^$$-$$12C²N^$$-$$1m^$$-$$2)

5.65 Wm^$$-$$2

4.24 Wm^$$-$$2

1.9 $$\times$$ 10^$$-$$7 Wm^$$-$$2

56.5 Wm^$$-$$2

JEE Main 2022 (Online) 24th June Evening Shift

MCQ (Single Correct Answer)

-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.

1.19 $$\times$$ 10^$$-$$8T

1.71 $$\times$$ 10^$$-$$8T

0.84 $$\times$$ 10^$$-$$8T

3.36 $$\times$$ 10^$$-$$8T

JEE Main 2022 (Online) 24th June Morning Shift

MCQ (Single Correct Answer)

-1

A plane electromagnetic wave travels in a medium of relative permeability 1.61 and relative permittivity 6.44. If magnitude of magnetic intensity is 4.5 $$\times$$ 10^$$-$$2 Am^$$-$$1 at a point, what will be the approximate magnitude of electric field intensity at that point?

(Given : Permeability of free space $$\mu$$₀ = 4$$\pi$$ $$\times$$ 10^$$-$$7 NA^$$-$$2, speed of light in vacuum c = 3 $$\times$$ 10⁸ ms^$$-$$1)

16.96 Vm^$$-$$1

2.25 $$\times$$ 10^$$-$$2 Vm^$$-$$1

8.48 Vm^$$-$$1

6.75 $$\times$$ 10⁶ Vm^$$-$$1

JEE Main 2021 (Online) 1st September Evening Shift

MCQ (Single Correct Answer)

-1

Electric field of plane electromagnetic wave propagating through a non-magnetic medium is given by

E = 20cos(2 $$\times$$ 10¹⁰ t $$-$$ 200x) V/m. The dielectric constant of the medium is equal to : (Take $$\mu$$_r = 1)

$${1 \over 3}$$

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