Question
Can an electromagnetic wave be polarised?
✓
Answer
An electromagnetic wave is a transverse wave, thus, it can be polarised. An unpolarised wave consists of many independent waves, whose planes of vibrations of electric and magnetic fields are randomly oriented. They are polarised by restricting the vibrations of the electric field vector or magnetic field vector in one direction only.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A 100W light bulb is placed at the centre of a spherical chamber of radius 20cm. Assume that 60% of the energy supplied to the bulb is converted into light and that the surface of the chamber is perfectly absorbing. Find the pressure exerted by the light on the surface of the chamber.
A coil of inductance 5.0mH and negligible resistance is connected to the oscillator of the previous problem. Find the peak currents in the circuit for $\omega=100\text{s}^{-1},500\text{s}^{-1},1000\text{s}^{-1}.$
→- A point charge q moving with speed v enters a uniform magnetic field B that is acting into the plane of the paper as shown. What is the path followed by the charge q and in which plane does it move?
- How does the path followed by the charge get affected if its velocity has a component parallel to $\overrightarrow{\text{B}}$?
- If an electric field $\overrightarrow{\text{E}}$ is also applied such that the particle continues moving along the original straight line path, what should be the magnitude and direction of the electric field $\overrightarrow{\text{E}}$?
A certain material has refractive indices 1.56, 1.60 and 1.68 for red, yellow and violet light respectively.
- Calculate the dispersive power.
- Find the angular dispersion produced by a thin prism of angle 6° made of this material.
Using Gauss’s law in electrostatics, deduce an expression for electric field intensity due to a uniformly charged infinite plane sheet. If another identical sheet is placed parallel to it, show that there is no electric field in the region between the two sheets.
Establish an expression for mobility by giving definition of mobility. Establish relation between mobility of free electrons and electric current.
A number of identical cells, n, each of emf E, internal resistance r connected in series are charged by a d.c. source of emf E', using a resistor R.
- Draw the circuit arrangement.
- Deduce the expressions for (a) the charging current and (b) the potential difference across the combination of the cells.
When charcoal is prepared from a living tree, it shows a disintegration rate of 15.3 disintegrations of ${ }^{14} \mathrm{C}$ per gram per minute. A sample from an ancient piece of charcoal shows ${ }^{14} \mathrm{C}$ activity to be 12.3 disintegrations per gram per minute. How old is this sample? Half-life of ${ }^{14} \mathrm{C}$ is 5730 y .
→A light ray incident at grazing angle on the face AB of a prism ABC, follows the path shown in the figure. Obtain the relation between the angle of prism A and the refractive index $\mu$ of its material.
→In a series LCR circuit, $\text{R = 1k}\Omega,\text{C}=2\mu\text{F}$ and voltage across R is 100V. The resonant frequency of the circuit $\omega$ is 200 rad $s^{-1}$. Calculate the value of voltage across L at resonance.
→