A electromagnetic wave in vacuum has the electric and magnetic fields E → and B → which are always perpendicular to each other. The direction of polarization is given by X → and wave propogation by K → then

X → ∥ E → and K → ∥ E → × B →

X → ∥ B → and K → ∥ E → × B →

X → ∥ E → and K → ∥ B → × E →

X → ∥ B → and K → ∥ B → × E →

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

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

For an electromagnetic wave propagating in + x direction the electric field is E → = 1 2 E y z x , t y ^ - z ^ and the magnetic field is B → = 1 2 B y z x , t y ^ + z ^

For an electromagnetic wave propagating in + y direction the electric field is E → = 1 2 E y z x , t z ^ and the magnetic field is B → = 1 2 B z x , t y ^

For an electromagnetic wave propagating in + y direction the electric field is E → = 1 2 E y z x , t y ^ and the magnetic field is B → = 1 2 B yz x , t z ^

For an electromagnetic wave propagating in + x direction the electric field is E → = 1 2 E y z y , z , t y ^ + z ^ and the magnetic field is B → = 1 2 E y z y , z , t y ^ + z ^

E M B I B E

Beta Question Bank for Engineering: Physics>Chapter 29 - Electromagnetic Waves>Exercise-1>Q 8

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The ozone layer in Earth's atmosphere is crucial for human survival because it

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Important Questions on Electromagnetic Waves

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Beta Question Bank for Engineering: Physics>Chapter 29 - Electromagnetic Waves>Exercise-1>Q 9

The AM range of the radio waves has a frequency of

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Beta Question Bank for Engineering: Physics>Chapter 29 - Electromagnetic Waves>Exercise-1>Q 10

Select wrong statement from the following for EMW -

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Beta Question Bank for Engineering: Physics>Chapter 29 - Electromagnetic Waves>Exercise-1>Q 11

The nature of electromagnetic wave is

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Beta Question Bank for Engineering: Physics>Chapter 29 - Electromagnetic Waves>Exercise-1>Q 12

The RMS value of the electric field of light coming from the sun is

720 N / C

. The total average energy density of the electromagnetic wave is

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Beta Question Bank for Engineering: Physics>Chapter 29 - Electromagnetic Waves>Exercise-1>Q 13

A electromagnetic wave in vacuum has the electric and magnetic fields

\vec{E}

and

\vec{B}

which are always perpendicular to each other. The direction of polarization is given by

\vec{X}

and wave propogation by

\vec{K}

then

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Beta Question Bank for Engineering: Physics>Chapter 29 - Electromagnetic Waves>Exercise-1>Q 14

An electromagnetic wave with frequency

𝜔

and wavelength

λ

travels in the

+ y

-direction. Its magnetic field is along

- x

-axis. The vector equation for the associated electric field (of amplitude

E_{0}

) is

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Beta Question Bank for Engineering: Physics>Chapter 29 - Electromagnetic Waves>Exercise-1>Q 15

Match List - I (Electromagnetic wave type) with List - II (Its association/application) and select the correct option from the choices given below the lists :

	List - I		List - II
(a)	Infrared waves	(i)	To treat muscular strain
(b)	Radio waves	(ii)	For broadcasting
(c)	X - rays	(iii)	To detect fracture of bones
(d)	Ultraviolet rays	(iv)	Absorbed by the ozone layer of the atmosphere