Beta Question Bank for Engineering: Physics>Chapter 29 - Electromagnetic Waves>Exercise-1>Q 6

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In an electromagnetic wave, the average energy density associated with the magnetic field will be

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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 8

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

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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 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 17

An electromagnetic wave travelling in the

x

-direction has a frequency of

2 \times 10^{14} Hz

and electric field amplitude of

27 V m^{- 1}

. From the options given below, which one describes the magnetic field for this wave? (speed of light in vacuum

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

)

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Beta Question Bank for Engineering: Physics>Chapter 29 - Electromagnetic Waves>Exercise-1>Q 18

For plane electromagnetic waves propagating in the

z

direction, which one of the following combination gives the correct possible direction for

\vec{E}

and

\vec{B}

field, respectively?

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Beta Question Bank for Engineering: Physics>Chapter 29 - Electromagnetic Waves>Exercise-1>Q 19

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

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Beta Question Bank for Engineering: Physics>Chapter 29 - Electromagnetic Waves>Exercise-1>Q 21

The electric field component of a monochromatic radiation is given by

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

. Its magnetic field

\vec{B}

is then given by

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Beta Question Bank for Engineering: Physics>Chapter 29 - Electromagnetic Waves>Exercise-1>Q 22

An

EM

wave from air enters a medium. The electric fields are in

{\vec{E}}_{1} = E_{01} \hat{x} \cos [2 π v (\frac{z}{c} - t)]

air and

{\vec{E}}_{2} = E_{02.} \hat{x} \cos [k (2 z - c t)]

in medium, when the wave number

k

and frequency

v

refer to their values in air. The medium is non-magnetic. If

\in_{r_{1}}

are

\in_{r_{2}}

refer to relative permittivity of air and medium respectively, which of the following options is correct?