Out of the following options which one can be used to produce a propagating electromagnetic wave?

A charge moving at constant velocity

The ratio of the amplitude of the magnetic field to the amplitude of electric field for an electromagnetic wave propagating in vacuum is equal to

reciprocal of speed of light in vacuum

the ratio of magnetic permeability to the electric susceptibility of vacuum

The decreasing order of the wavelength of infrared, microwave, ultraviolet and gamma rays is

microwave, infrared, ultraviolet, gamma rays

gamma rays, ultraviolet, infrared, microwaves

microwaves, gamma rays, infrared, ultraviolet

infrared, microwave, ultraviolet, gamma rays

Which of the following statements is false for the properties of electromagnetic waves?

Both electric and magnetic field vectors are parallel to each other and perpendicular to the direction of propagation of the wave

Both electric and magnetic field vectors attain the maxima and minima at the same place and the same time

The energy in an electromagnetic wave is divided equally between electric and magnetic vectors

These waves do not require any material medium for propagation

The electric field part of an electromagnetic wave in a medium is represented by E x =0; E y = 2 . 5 N C cos 2 π × 10 6 rad m t - π × 10 - 2 rad s x E s = 0. The wave is

Moving along x-direction with frequency 10 6 Hz and wavelength 200m

Moving along y-direction with frequency 21 π x 10 6 Hz and wavelength 200 m.

Moving along x-direction with frequency 10 6 Hz and wavelength 100m

Moving along x-direction with frequency 10 6 Hz and wavelength 800m

Physics - Electromagnetic Waves - Quiz-1

The electric and magnetic field of an electromagnetic wave are :

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in phase and parallel to each other
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in opposite phase and perpendicular to each other
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in opposite phase and parallel to each other
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in phase and perpendicular to each other

Which colour of the light has the longest wavelength?

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violet
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red
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blue
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green

A parallel plate capacitor of capacitance 20 $μ$ F is being charged by a voltage source whose potential is changing at the rate of 3 V/s. The conduction current through the connecting wires, and the displacement current through the plates of the capacitor, would be, respectively:

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zero, zero
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zero, 60 $μ$ A
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60 $μ$ A, 60 $μ$ A
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60 $μ$ A, zero

Displacement current is same as:

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Conduction current due to the flow of free electrons
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Conduction current due to the flow of positive ions
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Conduction current due to the flow of both positive and negative free charge carriers
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It is not a conduction current but is caused by the time-varying electric field

The maxwell's equation:

$\oint \vec{B} . \vec{d l} = μ_{0} (i + ε_{0} . \frac{d ϕ_{E}}{d t})$ is a statement of :

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Faraday's law of induction
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Modified Ampere's law
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Gauss's law of electricity
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Gauss's law of magnetism

The charge of a parallel plate capacitor is varying as $q = q_{0} \sin ω t$ . Then find the magnitude of displacement current through the capacitor. (Plate Area = A, separation of plates = d)

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$q_{0} \cos (ω t)$
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$q_{0} ω \sin ω t$
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$q_{0} ω \cos ω t$
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$\frac{q_{0} A ω}{d} \cos ω t$

An electromagnetic wave is propagating along Y-axis. Then:

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The oscillating electric field is along X-axis and the oscillating magnetic field is along Y-axis.
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The oscillating electric field is along Z-axis and the oscillating magnetic field is along X-axis.
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Both oscillating electric and magnetic fields are along Y-axis, but the phase difference between them is $90^{°}$
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Both oscillating electric and magnetic fields are mutually perpendicular in arbitrary directions.

In electromagnetic wave the phase difference between electric and magnetic field vectors $\vec{E} a n d \vec{B}$ is :

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0
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$π / 2$
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$π$
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$π / 4$

An electromagnetic wave going through the vacuum is described by $E = E_{0} \sin (k x - ω t)$

Which is the following is/are independent of the wavelength?

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k
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$k / ω$
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$k ω$
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$ω$

In a plane E.M. wave, the electric field oscillates sinusoidally at a frequency of 2.5 $\times 10^{10}$ Hz and amplitude 480 V/m. The amplitude of the oscillating magnetic field will be:

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$1.52 \times 10^{- 8} W b / m^{2}$
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$1.52 \times 10^{- 7} W b / m^{2}$
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$1.6 \times 10^{- 6} W b / m^{2}$
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$1.6 \times 10^{- 7} W b / m^{2}$

The energy density of the electromagnetic wave in vacuum is given by the relation

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$\frac{1}{2} . \frac{E^{2}}{ε_{0}} + \frac{B^{2}}{2 μ_{0}}$
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$\frac{1}{2} ε_{0} E^{2} + \frac{1}{2} μ_{0} B^{2}$
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$\frac{E^{2} + B^{2}}{C}$
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$\frac{1}{2} ε_{0} E^{2} + \frac{B^{2}}{2 μ_{0}}$

A lamp radiates power $P_{0}$ uniformly in all directions, the amplitude of electric field strength $E_{0}$ at a distance r from it is:

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$E_{0} = \frac{P_{0}}{2 {πε}_{0} {cr}^{2}}$
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$E_{0} = \sqrt{\{\frac{P_{0}}{2 {πε}_{0} c r^{2}}\}}$
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$E_{0} = \sqrt{\{\frac{P_{0}}{4 {πε}_{0} {cr}^{2}}\}}$
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$E_{0} = \sqrt{\{\frac{P_{0}}{8 {πε}_{0} {cr}^{}}\}}$

The intensity of visible radiation at a distance of 1 m from a bulb of 100 W which converts only 5% its power into light is :

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0.4 W / m²
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0.5 W / m²
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0.1 W / m²
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0.01 W / m²

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Practice Physics Quiz Questions and Answers

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Practice Physics Quiz Questions and Answers

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