JEE Main 2021 (Online) 26th August Evening Shift | Electromagnetic Waves Question 74 | Physics

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

JEE Main 2021 (Online) 22th July Evening Shift

MCQ (Single Correct Answer)

-1

Intensity of sunlight is observed as 0.092 Wm^$$-$$2 at a point in free space. What will be the peak value of magnetic field at the point?

($${\varepsilon _0} = 8.85 \times {10^{ - 12}}{C^2}{N^{ - 1}}{m^{ - 2}}$$)

2.77 $$\times$$ 10^$$-$$8 T

1.96 $$\times$$ 10^$$-$$8 T

8.31 T

5.88 T

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