In an electromagnetic wave, how are electric vector ( E → ) , magnetic vector ( B → ) and velocity of propagation of the wave ( C → ) oriented.

E → & B → are perpendicular to each other and C → is perpendicular to both E → & B → and the planes are E → - C → , B → - C → , E → - B →

What is the phase difference, if any, between the electric field E → and magnetic field B → associated with a plane-polarised light?

Since there is no time difference between the peaks of the electric and magnetic oscillations and when plane polarised E → & B → are in the same phase So, there would be no phase difference.

What are the dimensions and the value of 1 μ 0 ε 0 ?

The speed of electromagnetic waves in free space worked out by Maxwell 1 μ 0 ∈ 0 is equal to the speed of light. So the unit of 1 μ 0 ∈ 0 is equal to the unit of light. S.I. unit = m/s, and value of C = 3 × 10 8 m / s . So, Dimensions = L T - 1

E M B I B E

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 13 - Electromagnetic Waves>QUESTIONS>Q 1

MEDIUM

12th ICSE

IMPORTANT

Earn 100

What oscillates in electromagnetic waves? Are these waves transverse or longitudinal?

Important Questions on Electromagnetic Waves

MEDIUM

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 13 - Electromagnetic Waves>QUESTIONS>Q 2

A plane Em wave is travelling in vacuum along X-direction. What can you say about the direction of magnetic and electric fields? The frequency of the wave is

30

MHz, what is its wavelength?

MEDIUM

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 13 - Electromagnetic Waves>QUESTIONS>Q 3

In an electromagnetic wave, how are electric vector

(\vec{E})

, magnetic vector

(\vec{B})

and velocity of propagation of the wave

(\vec{C})

oriented.

MEDIUM

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 13 - Electromagnetic Waves>QUESTIONS>Q 4

At any instant, the electric field

\vec{E}

, magnetic field

\vec{B}

and velocity vector

\vec{c}

are mutually perpendicular to each other, for a linearly polarised ray of light. Identify (name) three different planes, which are mutually perpendicular to each other.

EASY

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 13 - Electromagnetic Waves>QUESTIONS>Q 5

What is the phase difference, if any, between the electric field