JEE Main 2021 (Online) 27th August Morning Shift | Electromagnetic Waves Question 73 | Physics

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

A light beam is described by $$E = 800\sin \omega \left( {t - {x \over c}} \right)$$. An electron is allowed to move normal to the propagation of light beam with a speed of 3 $$\times$$ 10⁷ ms^$$-$$1. What is the maximum magnetic force exerted on the electron?

1.28 $$\times$$ 10^$$-$$18 N

1.28 $$\times$$ 10^$$-$$21 N

12.8 $$\times$$ 10^$$-$$17 N

12.8 $$\times$$ 10^$$-$$18 N

JEE Main 2021 (Online) 27th July Morning Shift

MCQ (Single Correct Answer)

-1

The relative permittivity of distilled water is 81. The velocity of light in it will be :

(Given $$\mu$$_r = 1)

4.33 $$\times$$ 10⁷ m/s

2.33 $$\times$$ 10⁷ m/s

3.33 $$\times$$ 10⁷ m/s

5.33 $$\times$$ 10⁷ m/s

JEE Main 2021 (Online) 25th July Morning Shift

MCQ (Single Correct Answer)

-1

A linearly polarized electromagnetic wave in vacuum is

$$E = 3.1\cos \left[ {(1.8)z - (5.4 \times {{10}^6})t} \right]\widehat iN/C$$

is incident normally on a perfectly reflecting wall at z = a. Choose the correct option

The wavelength is 5.4 m

The frequency of electromagnetic wave is 54 $$\times$$ 10⁴ Hz.

The transmitted wave will be $$3.1\cos \left[ {(1.8)z - (5.4 \times {{10}^6})t} \right]\widehat iN/C$$

The reflected wave will be $$3.1\cos \left[ {(1.8)z + (5.4 \times {{10}^6})t} \right]\widehat iN/C$$

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