Question 2 :
Fill in the blanks. <br>Current flowing through the resistor is known as ________ <span>, while the current flowing through the capacitor is commonly known as _______. </span>
Question 4 :
In electromagnetic wave, according to Maxwell, changing electric field gives _______.<br/>
Question 5 :
<span>An electromagnetic radiation has an energy of 13.2 keV. Then the radiation belongs to the region of</span>
Question 8 :
Choose the correct answer from the alternatives given.<br>The conduction current is the same as displacement current when the source is<br>
Question 10 :
According to Maxwell's equation, the velocity of light in any medium is expressed as
Question 13 :
Maxwell's corrections to Ampere's law was required when the later was extended to:<br>
Question 14 :
Choose the correct answer from the alternatives given.<br>Displacement current goes through the gap between the plates of a capacitor when the charge of the capacitor<br>
Question 16 :
In a parallel C-R network with a voltage source, the current flowing through resistor is _______ current and that flowing through the capacitor is ________ current.<br>
Question 17 :
The displacement current flows in the dielectric of a capacitor when the potential difference across its plates<br>
Question 18 :
The frequency of electromagnetic wave in free space is $2$ MHz. When it passes through a region of relative permittivity $\varepsilon_r=4.0$, then its wave length __________ & frequency ______________.
Question 20 :
The propagation constant of a photon of wavelength $6284 \ A^o$ 
Question 21 :
Identify which of the following is NOT a characteristic of electromagnetic waves?<br/>
Question 22 : <span class="wysiwyg-font-size-small"><p class="wysiwyg-text-align-justify">The frequency of incident light falling on a photosensitive metal plate is doubled, the kinetic energy of the emitted photoelectrons is<br></p></span>
Question 23 :
According to Maxwell's hypothesis, a changing electric field gives rise to
Question 24 :
If the directions of electric and magnetic field vectors of a plane electromagnetic wave are along positive $y$-direction and positive $z$-direction respectively, then the direction of propagation of the wave is along:
Question 26 :
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 27 :
Choose the correct answer from the alternatives given.<br/>An electromagnetic wave of frequency $\nu= 3\ MHz$ passes from vacuum  into a dielectric medium with permittivity $\varepsilon= 4$. Then
Question 28 :
The ratio of amplitude of a magnetic field to the amplitude of electric field for an electromagnetic wave propagating in vacuum is equal to
Question 29 :
Which of the following effects could not be explained by Maxwell's electromagnetic wave theory?
Question 30 :
An electromagnetic wave radiates outwards from a dipole antenna, with ${ E }_{ 0 }$ as the amplitude of its electric field vector. The electric field ${ E }_{ 0 }$ which transports significant energy from the source falls off as
Question 31 :
Assume you are sitting in sun for 2.5 hours. The area of your body exposed normally to sun rays $ { 1.3m }^{ 2 }$. The intensity of sun rays is 1.1 Kilowatt/${ m }^{ 2 }$. If your body completely absorbs the sun rays then the momentum transferred to your body will be (in Kg-m/s):<br/>
Question 32 :
Which one of the following is the primary effect of UV radiation caused due to depletion of ozone layer?
Question 33 :
The concept of displacement current introduced by Maxwell removes asymmetry between
Question 34 :
The electric field of an electromagnetic wave traveling through the vacuum is given by the equation $E=E_0\ sin (Kx-\omega t).$ The quantity that is independent of wavelength is:
Question 35 :
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 36 :
The oscillating electric and magnetic vectors of an electromagnetic wave are oriented along
Question 37 :
A parallel plate condenser of capacity $1 nF$ is connected to a battery of emf $2v$ though a resistance of $1M \Omega$. The displacement current after $10^{-3}\ \sec$ is:
Question 38 :
Displacement current goes through the gap between the plates of a capaitor when the charge of the capacitor:<br/>(i) does not change<br/>(ii) change with time<br/>(iii) increases<br/> (iv) decreases
Question 39 :
<span>An electromagnetic wave radiates outwards from a dipole antenna, with $E_0$ as the amplitude of its electric field vector. The electric field $B_0$ which transports significant energy from the source falls off as</span>
Question 40 :
If the wavelength of red light in air is $7500$ $\overset{o}{A}$, then the frequency of light in air is ___________.
Question 41 :
Choose the correct answer from the alternatives given.<br>The amplitude of an electromagnetic wave in vaccum is doubled with no other changes made to the wave. As a result of this doubling of the amplitude, which of the following statement is correct?
Question 42 :
A radio wave of frequency $90MHz$ (FM) enter into a ferrite rod. If ${ \varepsilon  }_{ r }={ 10 }^{ 3 }$ and ${{\mu}_{r}}=10$, then the velocity and wavelength radio wave in ferrite rod is:<br/>
Question 43 :
Assertion: Dipole oscillations produce electromagentic waves, <br>Reason : Accelerated charge produces electromagnetic waves
Question 44 :
The pressure exerted by an electromagnetic wave of intensity $\displaystyle I\left( { watt }/{ { m }^{ 2 } } \right) $ on a non-reflecting surface is : [c is the velocity of light] <br>
Question 45 :
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 46 :
The electric and the magnetic field, associated with an E.M. wave , propagating along the $+z$ axis, can be represented by
Question 48 :
The charge on a parallel plate capacitor is varying as $q={ q }_{ 0 }\sin { \left( 2\pi nt \right)  } $. The plates are very large and close together. neglecting the edge effects, the displacement current through the capacitor is:<br/>
Question 49 :
Two waves having same velocity enter electric and magnetic fields respectively. If $\lambda _{1}$and$\lambda _{2}$ are their wavelengths as they move in the fields, then<br>
Question 50 :
If a source is transmitting electro-magnetic waves of frequency $8.196\times 10^{6}Hz$, then the wavelength of the electro-magnetic waves transmitted from the source will be
Question 51 :
According to the electromagnetic wave theory, light consists of electric and magnetic fields which are __________.
Question 52 :
The charge on a parallel plate capacitor varies as $q = {q}_{0}cos2vt$. The plates are very large and close together (area = A, separation = d ) , the displacement current through the capacitor is
Question 53 :
A plane electromagnetic wave of wavelength $\lambda$ has an intensity $I$. It is propagating along the positive $Y-direction$. The allowed expressions for the electric and magnetic fields are given by
Question 54 :
<span>The amplitude of the sinusoidally oscillating electric field of a plane wave is 60v /m. Then the amplitude of the magnetic field is</span>
Question 55 :
Electromagnetic wave of intensity $1400\ W/m^{2}$ falls on metal surface on area $1.5\ m^{2}$ is completely absorbed by it. Find out force exerted by beam.
Question 56 :
Choose the correct answer from alternatives given.<br>If $\vec { E } $ and $\vec { B } $ represent electric and magnetic field vectors of an electromagnetic wave, the direction of propagation of the wave is along
Question 57 :
Choose the correct answer from the alternatives given.<br>Which among the following does not represent Maxwell's equation?
Question 58 :
The electric field portion of an electromagnetic wave is given by(all variables in SI units) $E=10^{-4}\sin(6\times 10^5t-0.01x)$. The frequency (f) and the speed(v) of electromagnetic wave are?
Question 59 :
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 60 :
A light beam travelling in the x-direction is described by the electric field ${E_y} = 300v/m\sin \left( {t - \frac{x}{c}} \right)$. An electron is constrained to move along the y-direction with a speed of $2.0 \times {10^7}m/s.$ Find the maximum magnetic force on the electron.
Question 61 :
A plane electromagnetic wave with a single frequency moves in vacuum in the positive $x$ direction. Its amplitude is uniform over the $yz$ plane. the amplitude of its magnetic field. 
Question 62 : The electric field for an electromagnetic wave in free space is $\vec{E}=\vec{i}30\cos(kz-5\times 10^8t)$, where magnitude of $\vec E$ is in $V/m$. The magnitude of wave vector, $k$ is:<div>(velocity of em wave in free space $=3\times 10^8m/s$)</div>
Question 63 :
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 64 :
A plane polarized monochromatic $EM$ wave is traveling in vacuum along $z$ direction such that at $t={t}_{1}$ it is found that the electric field is zero at a spatial point ${z}_{1}$. The next zero that occurs in its neighborhood is at ${z}_{2}$. The frequency of the electromagnetic wave is:
Question 65 :
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 66 :
An electromagnetic wave passing through vacuum is described by the equations. $E=E_0\sin(kx-\omega t)$ and $B=B_0\sin(kx-\omega t)$. Then.
Question 67 : <div>Maxwell's four equations are written as</div><div>(i) $\oint { \overrightarrow { E } .\overrightarrow { d } s } =\cfrac { { q }_{ 0 } }{ { \varepsilon  }_{ 0 } } \quad $</div><div>(ii)$\oint { \overrightarrow { B } .\overrightarrow { d } s } =0$</div><div>(iii)$\oint { \overrightarrow { E } .\overrightarrow { d } l } =\cfrac { d }{ dt } \quad \oint { \overrightarrow { B } .\overrightarrow { d } s } $</div>(iv)$\oint { \overrightarrow { B } .\overrightarrow { d } s } ={ \mu  }_{ 0 }{ \varepsilon  }_{ 0 }\cfrac { d }{ dt } \quad \oint { \overrightarrow { E } .\overrightarrow { d } s }  $<div>Which of the above Maxwell's equations shows that electric field lines do not form closed loops?<br/></div>
Question 68 :
Choose the correct answer from the alternatives given.<br>Which of the following is not true for electromagnetic waves?
Question 69 :
The amplitude of the magnetic field of a harmonic electromagnetic wave in vacuum is ${B}_{0}$ = 510 nT. The amplitude of the electric field part of the wave is
Question 70 :
If $\vec{E}$ and $\vec{B}$ are the electric and magnetic field vectors of electromagnetic waves then the direction of propagation of electromagnetic wave is along the direction of:
Question 71 :
The electric field intensity at a point in vacuum is equal to
Question 73 :
The electric field associated with an electromagnetic wave in vacuum is given by $|\overrightarrow { E } |= 40\ cos (kz -6\times{10}^{8}t )$, where $E$, $z$ and $t$ are in volt per meter, meter and second respectively. The value of wave vector $k$ is:
Question 74 :
A parallel plate capacitor with plate are $A$ and seperation between the plates $d,$ is charged byb a constant current $i,$ consider a plane surface of area $A/2$ parallel to the plates and drawn symmetrically between the plates, the displacement current through this area, will be.
Question 75 : Some devices and electromagnetic wave are given in Column -I and Column - II, match the device with electromagnetic wave work:<table class="wysiwyg-table"><tbody><tr><td>Column - I</td><td>Column - II</td></tr><tr><td>(A) Mobile<br>(B) Sonar<br>(C) Radar<br>(D) Optical fiber</td><td>(P) Microwave<br>(Q) IR<br>(R) Radio wave<br>(S) Ultra sound</td></tr></tbody></table>
Question 76 :
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 77 :
In an electromagnetic wave, the electric and magnetic fields are $100 Vm ^{-1}$ and $0.265 Am$ maximum energy flow is
Question 78 :
<i></i>Choose the correct answer from the alternatives given.<br/>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 drawn between the plates. The displacement current through the area is :
Question 79 :
A plane e.m wave of frequency $30MHz$ travels in free space along the x-direction. The electric field component of the wave at a particular point of space and time $E=6V/m$ along $y$-direction. Its magnetic field component $B$ at this point would be
Question 80 :
A monochromatic beam of light has a frequency $v=\cfrac { 3 }{ 2\pi } \times { 10 }^{ 12 }Hz$ and is propagating along the direction $\cfrac { \hat { i } +\hat { j } }{ \sqrt { 2 } } $. It is polarized along the $\hat { k } $ direction. The acceptable form for the magnetic field is:
