Question 1 :
A parallel plate capacitor with plate area A and separation between the plates $d$, is charged by a constant current $i$. Consider a plane surface of area $\dfrac{A}{2}$ parallel to the plate and down symmetrically between the plates. Find the displacement current through this area.
Question 3 :
Choose the correct answer from the alternatives given.<br/>A plane electromagnetic wave of frequency $25 MHz$ travels in free space along $X$-direction. At a particular point in space and time, electric field $\vec E=6.3\ \hat j\ V/m$. What is $B$ at this point.<br/>
Question 4 :
According to the electromagnetic wave theory, light consists of electric and magnetic fields which are __________.
Question 5 :
A parallel plate condenser has circular plates$,$ each of radius $5cm.$ It is being charged so that electric field in the gap between its plates rises steadily at the rate of ${10^{12}}V/ms.$  What is the displacement current$?$ 
Question 6 :
What is the frequency of electromagnetic waves in a vacuum that have the same wavelength as a $500.0\ Hz$ sound wave moving at $345\ m/s$?
Question 7 :
An electromagnetic wave, going through vacuum is described by $E=E_0\sin{(kx-\omega t)}$. Which of the following is independent of wavelength?
Question 8 :
An em wave is propagating in a medium with a velocity $\overrightarrow{V}=V\hat{i}$. The instantaneous oscillating electric field of this em wave is along $+$y axis. Then the direction of oscillating magnetic field of the em wave will be along.
Question 9 :
Assertion: When variable frequency a.c. source is connected to a capacitor, displacement current increases with increase in frequency.
Reason: As frequency increases conduction current also increases.
Question 10 :
The part of the spectrum of the electromagnetic radiation used to cook food is then<br/>
Question 11 :
A plane electromagnetic wave of frequency $50MHz$ travels in free space along the positive x-direction. At a particular point in space and time, $\overrightarrow{E} = 6.3\hat{j}V/m$. The corresponding magnetic field $\overrightarrow{B}$, at that point will be:
Question 12 :
In the propagation of electromagnetic waves, the angle between the direction of propagation and plane of polarisation is
Question 13 :
Two waves having same velocity enter electric andmagnetic fields respectively. If $\lambda _{1}$and$\lambda _{2}$ are theirwavelengths as they move in the fields, then<br>
Question 14 :
The frequency of electromagnetic wave which is best suitable to observe particle of radius $3 \times 10^{-4}$ cm is of the order of
Question 17 :
The time varying electric and magentic fields are ${E}=E_x\hat{i}+E_x\hat{j}+E_z\hat{k}$ and $B=B_x\hat{i}+B_y\hat{j}+B_z\hat{k}$ respectively. They generate a plane electromagnetic wave travelling towards x-direction in pair of space.
Question 18 :
Radiations of intensity $0.5\ W/m^{2}$ are striking a metal plate. The pressure on the plate is
Question 19 :
What is the frequency of electromagnetic waves in a vacuum that have the same wavelength as a 500.0 Hz sound wave moving at 345 m/s?
Question 20 :
Maxwell in his famous equations of electromagnetism, introduced the concept of
Question 21 :
The electric field of a plane electromagnetic wave is given by<br>$\overrightarrow { y }=E_0 \hat{i} cos(kz)(\omega t)$<br>The corresponding magnetic field $\overrightarrow { B }$ is then given by:
Question 22 :
Assertion: Dipole oscillations produce electromagentic waves,<br>Reason : Accelerated charge produceselectromagnetic waves
Question 23 :
The electric field associated with an e.m. wave in vacuum is given by $\vec {E} = 40\cos (kz - 6\times 10^{8}t)\hat {i}$, where $E, z$ and $t$ in $volt/m$, meter and seconds respectively. The value of wave vector $k$ is
Question 24 :
The electric field part of an electromagnetic wave in vacuum is$E=3.1\cos { \left[ \left( 1.8\dfrac { rad }{ m }  \right) y+\left( 5.4\times { 10 }^{ 8 }\dfrac { rad }{ s }  \right) t \right] \hat { i }  } $.The frequency corresponding to the given part of the electromagnetic wave is?
Question 25 :
A charged particle oscillates about its mean equilibrium position with a frequency of ${10}^{9}$ Hz. The frequency of electromagnetic waves produced by the oscillator is
Question 26 :
Light of intensity$ = 3 W/m^{2}$ is incident on a perfectly absorbing metal surface of area  $1 m^{2}$ making an angle of $60^0$ with the normal. If the force exerted by the photons on the surface is $p \times 10^{-9}$ (in Newton), then the value of p is :<br/>
Question 27 :
A free electron is placed in the path of a plane electromagnetic wave. The electron will start moving
Question 28 :
Suppose that the electric field amplitude of an electromagnetic wave propagating along x-direction is ${ E }_{ 0}$ = 120 N ${ C }^{ -1 }$ and that its frequency is $\upsilon$ = 50.0 MHz.
Question 29 :
A light of wavelength $6000 A^0$ in air, enters a medium with refractive index 1.5. What will be the wavelength of light in the medium?
Question 30 :
A $1.5\ kW$ (kilo-watt) laser beam of wavelength $6400 \mathring A$ is used to levitate a thin aluminium disc of same area as the cross section of the beam. The laser light is reflected by the aluminium disk without any absorption. The mass of the disc is close to:<br/>
Question 31 :
A plane EM wave travelling alone z-direction is described by ${ \overrightarrow { E } \  =\  { E }_{ 0 } }\sin { (kz\  -\  \omega t)\hat{ i } }$ and ${\vec B\  =\  { B }_{ 0 } }\sin { (kz\  -\  \omega t)\hat{ j } }$.
Question 32 :
A collimated beam of light of flux density $3k Wm^{-2}$ is incident normally on a $100 mm^2$ completely absorbing screen. If P is the pressure exerted on the screen and $\Delta p$ is the momentum transferred to the screen during a 1000 s interval, then<br>
Question 33 :
In an electromagnetic wave, the electric and magnetic fields are $100 Vm ^{-1}$and $0.265 Am$ maximum energy flow is
Question 34 :
The electric field part of an electromagnetic wave in vacuum is<br/>$E=3.1\cos { \left[ \left( 1.8\dfrac { rad }{ m }  \right) y+\left( 5.4\times { 10 }^{ 8 }\dfrac { rad }{ s }  \right) t \right] \hat { i }  } $ the wavelength of this part of electromagnetic wave is
Question 35 :
If $\vec{E}$ and $\vec{B}$ are the electric and magnetic field vectors of electromagnetic waves, then the direction of propagation of the electromagnetic wave is along the direction of<br>
