A monochromatic beam of light has a frequency v = 3 2 π × 10 12 Hz and is propagating along the direction i ^ + j ^ 2 . It is polarized along the k ^ direction. The acceptance form the magnetic field is:

E 0 C i ^ - j ^ 2 Cos ⁡ 10 4 i ^ + j ^ 2 . r → + 3 × 10 12 t

E 0 C i ^ + j ^ 2 Cos ⁡ 10 4 i ^ + j ^ 2 . r → - 3 × 10 12 t

E 0 C k ^ Cos ⁡ 10 4 i ^ + j ^ 2 . r → + 3 × 10 12 t

E 0 C i ^ + j ^ + k ^ 3 Cos ⁡ 10 4 i ^ + j ^ 2 . r → + 3 × 10 12 t

Magnetic field in a plane electromagnetic wave is given by, B → = B 0 sin k x + ω t j ^ T . Expression for corresponding electric field will be: (Where c is speed of light)

E → = B 0 c sin k x + ω t k ^ V m - 1

E → = - B 0 c sin k x + ω t k ^ V m - 1

E → = B 0 c sin k x - ω t k ^ V m - 1

E → = B 0 c sin k x + ω t k ^ V m - 1

Given below are two statements : Statement I : Electromagnetic waves are not deflected by electric and magnetic field. Statement II : The amplitude of electric field and the magnetic field in electromagnetic waves are related to each other as E 0 = μ 0 ε 0 B 0 . In the light of the above statements, choose the correct answer from the options given below:

Statement I is true but statement II is false

Both Statement I and Statement II are true

Statement I is false but statement II is true

Both Statement I and Statement II are false

MEDIUM

JEE Main

IMPORTANT

Earn 100

An EM wave from air enters a medium. The electric fields are ${\vec{E}}_{1} = E_{01} \hat{x} \cos [2 π v (\frac{z}{c} - t)]$ in air and ${\vec{E}}_{2} = E_{02} \hat{x} \cos [k (2 z - c t)]$ in medium, where the wave number k and frequency $v$ refer to their values in the air. The medium is non-magnetic. If $ϵ_{r_{1}}$ and $ϵ_{r_{2}}$ refer to relative permittivities of air and medium respectively, which of the following options, is correct?

20% studentsanswered this correctly

Important Questions on Electromagnetic Waves

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 17 - Electromagnetic Waves>JEE Main - 8th April 2018>Q 42

The mass of a hydrogen molecule is

3.32 \times 10^{- 27} kg .

10^{23}

hydrogen molecules strike, per second, a fixed wall of the area

2 {cm}^{2}

at an angle of

45^{o}

to the normal, and rebound elastically with a speed of

10^{3} m s^{- 1},

then the pressure on the wall is nearly:

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 17 - Electromagnetic Waves>JEE Main - 15th April 2018>Q 43

A monochromatic beam of light has a frequency

v = \frac{3}{2 π} \times 10^{12}

Hz

and is propagating along the direction

\frac{\hat{i} + \hat{j}}{\sqrt{2}}

. It is polarized along the

\hat{k}

direction. The acceptance form the magnetic field is:

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 17 - Electromagnetic Waves>JEE Main - 8th April 2017>Q 44

Magnetic field in a plane electromagnetic wave is given by,

\vec{B} = B_{0} \sin (k x + ω t) \hat{j} T

. Expression for corresponding electric field will be:

(Where

c

is speed of light)

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 17 - Electromagnetic Waves>JEE Main - 9th April 2017>Q 45

The electric field component of a monochromatic radiation is given by

\vec{E} = 2 E_{0} \cos k z \cos ω t \hat{i}

, Its magnetic field

\vec{B}

is then given by:

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 17 - Electromagnetic Waves>JEE Main - 9th April 2016>Q 46

Microwave oven acts on the principle of:

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 17 - Electromagnetic Waves>JEE Main - 10th April 2016>Q 47

Consider an electromagnetic wave propagating in vacuum. Choose the correct statement:

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 17 - Electromagnetic Waves>JEE Main - 10th April 2015>Q 48

An electromagnetic wave travelling in the

x -

direction has frequency of

2 \times 10^{14} H z

and electric field amplitude of

27 V m^{- 1}

oscillates in

Y -

direction. From the options given below, which one describes the magnetic field for this wave?

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 17 - Electromagnetic Waves>JEE Main - 4th April 2015>Q 49

A red $L E D$ emits light at $0.1 watt$ uniformly around it. The amplitude of the electric field of the light at a distance of $1 m$ from the diode is:

Important Questions on Electromagnetic Waves

Learn and Prepare for any exam you want !