Propagation Of EM Waves And Gauge Transformation MCQ Level - 1 - Physics MCQ

The correct answer is:  

The wave travelling along Z-axis can be written as, displacement 
+ sign along –ve Z-axis
– sign along +ve Z-axis
Since, the electric field is perpendicular to the different of the wave, i.e., perpendicular to Z-axis i.e., along X-axis or along Y-axis. Thus, 

Electromagnetic waves are transverse in nature, i.e., both E and  B  are perpendicular to each other.

The correct answer is: perpendicular to the electric field 

The frequency, wavelength and time period can all vary according to the wave producing source. But, the velocity of an electromagnetic wave depends upon the medium through which it is travelling. The velocity of a wave in a vacuum is termed as speed of light, which is assumed to be 3 x 10⁸ m/s.

The E and B vector of a light is perpendicular to each other and perpendicular to motion of the wave. E and B are related as
E = Bc, c being light velocity.

The correct answer is: 3.0 × 10^–5 T

For this to represent standing wave
A(z = 0) = 0 and A(z = L) = 0

The correct answer is: 

We know that electrostatic forces are given as –ve of gradient of a potential i.e.,

(Since curl of grad is zero)
Thus, Equation. (i) implies that electrostatic fields are those, for curl E₁.

E₁ is electrostatic field.
The correct answer is: Only  can represent electrostatic field

In an electromagnetic wave in free space the root mean square value of the electric field is E _rms = 6 V/m. The peak value of the magnetic field is. 1.41 × 10^–8 T.

If an electromagnetic wave is propagated through a non-conducting magnetic medium of dielectric constant ε and of refractive index n then they are related as refractive index n = (dielectric constant)^1/2 

The correct answer is: