A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 18 - Electromagnetic Waves>EXERCISE 18>Q 19

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IMPORTANT

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The energy contained in a small volume through which the electromagnetic wave is passing oscillates with

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Important Questions on Electromagnetic Waves

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IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 18 - Electromagnetic Waves>EXERCISE 18>Q 20

A free electron is placed in the path of a plane electromagnetic wave. The electron will start moving

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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 18 - Electromagnetic Waves>EXERCISE 18>Q 21

Magnetic field can be produced by

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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 18 - Electromagnetic Waves>EXERCISE 18>Q 22

A compass needle is placed in the gap of a parallel plate capacitor. The capacitor is connected to a battery through a resistance. The compass needle

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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 18 - Electromagnetic Waves>EXERCISE 18>Q 23

An 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 polarisation is given by

\vec{X}

and that of wave propagation by

\hat{k}

then

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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 18 - Electromagnetic Waves>EXERCISE 18>Q 24

The equation for the electric and magnetic fields as a function of x and t are respectively. A plane electromagnetic wave travelling along the X direction has a wavelength of

3 mm

. The variation in electric field occurs in the Y-direction with an amplitude

66 {Vm}^{- 1}

.

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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 18 - Electromagnetic Waves>EXERCISE 18>Q 25

The pressure on the plate is, where radiations of intensity $0.5 {Wm}^{- 2}$ are striking a metal plate.

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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 18 - Electromagnetic Waves>EXERCISE 18>Q 26

The dielectric constant of air is

1.006

. The speed of electromagnetic wave travelling in air is

a \times 10^{8} {mc}^{- 1}

, where

a

is ____.

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IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 18 - Electromagnetic Waves>EXERCISE 18>Q 27

Radiation of energy

E

falls normally on a perfectly reflecting surface. The momentum transferred to the surface is (

c

= Velocity of light)