The electric field of a plane electromagnetic wave is given by E → = E 0 i ^ c o s k z c o s ( ω t ) The corresponding magnetic field B → is then given by:

B → = E 0 c j ^ sin ⁡ k z s i n ( ω t )

B → = E 0 c j ^ cos ⁡ k z s i n ( ω t )

B → = E 0 c k ^ sin ⁡ k z c o s ( ω t )

B → = E 0 c j ^ sin ⁡ k z c o s ( ω t )

An electromagnetic wave is travelling in x -direction with electric field vector given by, E → y = E 0 sin k x - ω t j ^ . The correct expression for magnetic field vector is

B → z = E 0 c sin ( k x - ω t ) k ^

B → y = E 0 c sin k x - ω t j ^

B → z = E 0 c sin k x - ω t k ^

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Important Questions on Electromagnetic Waves

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The electric field of a plane electromagnetic wave is given by

\vec{E} = E_{0} \hat{i} c o s (k z) c o s (ω t)

The corresponding magnetic field

\vec{B}

is then given by:

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Physics>Modern Physics>Electromagnetic Waves>Electromagnetic Spectrum

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

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An electromagnetic wave is represented by the electric filed

\vec{E} = E_{0} \hat{n} \sin [ω t + (6 y - 8 z)] .

Taking unit vectors in

x, y

and

z

directions to be

\hat{i}, \hat{j}, \hat{k},

the directions of propagations

\hat{s},

is:

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The E.M. wave with shortest wavelength among the following is

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The waves used by artificial satellites for communication purposes are

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Physics>Modern Physics>Electromagnetic Waves>Electromagnetic Spectrum

The ratio of contributions made by the electric field and magnetic field components to the intensity of an electromagnetic wave is:
(

c =

speed of electromagnetic waves)

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Which colour of the light has the longest wavelength?

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Physics>Modern Physics>Electromagnetic Waves>Electromagnetic Spectrum

If the intensity of sun light outside earth's atmosphere is

1.4 kW {cm}^{- 2}

, the corresponding maximum electric field amplitude is, approximately (Assume

μ_{0} = 4 π \times 10^{- 7} H m^{- 1}

)

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The magnetic field in a travelling electromagnetic wave has a peak value of

20 nT

. The peak value of electric field strength is :

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In an electromagnetic wave in free space the root mean square value of the electric field is

E_{r m s} = 6 V m^{- 1}

. The peak value of the magnetic field is

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In an electromagnetic wave

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If the magnetic field of a plane electromagnetic wave is given by (The speed of light

= 3 \times 10^{8} m s^{- 1}

)

B = 100 \times 10^{- 6} \sin [2 π \times 2 \times 10^{15} (t - \frac{x}{c})]

then the maximum electric field associated with it is:

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Physics>Modern Physics>Electromagnetic Waves>Electromagnetic Spectrum

A plane electromagnetic wave of frequency

30 MHz

is travelling along

\hat{k}

- direction. At a particular point of space and time of propagation, if the electric field is given by

\vec{E} = 30 Volts {meter}^{- 1}

(- \hat{i}),

then the corresponding magnetic field is

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An electromagnetic wave is travelling in

x

-direction with electric field vector given by,

{\vec{E}}_{y} = E_{0} \sin (k x - ω t) \hat{j}

. The correct expression for magnetic field vector is

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The permeability of a medium whose refractive index is

1.5

and permittivity is

4.43 \times 10^{- 11} F m^{- 1}

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The electromagnetic wave used in

LASIK

eye surgery is

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The amplitude of the electric field in a parallel beam of plane electromagnetic waves of intensity

53.1 {Wm}^{- 2}

is
(Permittivity of free space

= 8.85 \times 10^{- 12} C^{2} N^{- 1} m^{- 2}

)

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Physics>Modern Physics>Electromagnetic Waves>Electromagnetic Spectrum

During the propagation of electromagnetic wave in a particular medium :-

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The energy of the em waves is of the order of

15 keV

. To which part of the spectrum does it belong?

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Out of the following options which one can be used to produce a propagating electromagnetic wave?

What is the wavelength range of visible light ?

Important Questions on Electromagnetic Waves

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