The dimension of \(\frac { 1 }{ { \mu }_{ 0 }{ \varepsilon }_{ 0 } } \) is _____.

(a)

[LT^-1]

(b)

[L²T^-2]

(c)

[L^-1T]

(d)

[L^-2T²]

If the amplitude of the magnetic field is 3 x 10⁻⁶ T, then amplitude of the electric field for a electromagnetic waves is _____.

(a)

100 V m⁻¹

(b)

300 V m^-1

(c)

600 V m^-1

(d)

900 V m^-1

Which of the following electromagnetic radiations is used for viewing objects through fog 

(a)

microwave

(b)

gamma rays

(c)

X- rays

(d)

infrared

Which of the following is false for electromagnetic waves

(a)

transverse

(b)

non-mechanical waves

(c)

longitudinal

(d)

produced by accelerating charges

Consider an oscillator which has a charged particle oscillating about its mean position with a frequency of 300 MHz. The wavelength of electromagnetic waves produced by this oscillator is _____.

(a)

1 m

(b)

10 m

(c)

100 m

(d)

1000 m

The electric and the magnetic fields, associated with an electromagnetic wave, propagating along negative X axis can be represented by _____.

(a)

\(\vec { E } ={ E }_{ 0 }\hat { i } \) and \(\vec { B } ={ B }_{ 0 }\hat { k } \)

(b)

\(\vec { E } ={ E }_{ 0 }\hat { k } \) and \(\vec { B } ={ B }_{ 0 }\hat { j } \)

(c)

\(\vec { E } ={ E }_{ 0 }\hat { i } \) and \(\vec { B } ={ B }_{ 0 }\hat { j } \)

(d)

\(\vec { E } ={ E }_{ 0 }\hat { j } \) and \(\vec { B } ={ B }_{ 0 }\hat { i } \)

In an electromagnetic wave traveling in free space the rms value of the electric field is 3 V m⁻¹. The peak value of the magnetic field is _____.

(a)

1.414 x 10^-8 T

(b)

1.0 x 10^-8 T

(c)

2.828 x 10^-8 T

(d)

2.0 x 10^-8 T

If the magnetic monopole exists, then which of the Maxwell’s equation to be modified?

(a)

\(\oint { \vec { E } .d\vec { A } } =\frac { { Q }_{ enclosed } }{ { \in }_{ 0 } } \)

(b)

\(\oint { \vec { B } .d\vec { A } } \) = 0

(c)

\(\oint { \vec { B } .d\vec { l } } ={ \mu }_{ 0 }{ i }_{ c}+{ \mu }_{ 0 }{ \in }_{ 0 }\frac { d }{ dt } \oint_s { \vec { E } .d\vec { A } } \)

(d)

\(\oint { \vec { E } .d\vec { l } } =-\frac { d }{ dt } { \Phi }_{ B }\)

Which of the following is an electromagnetic wave?

(a)

α - rays

(b)

β - rays

(c)

\(\gamma\) - rays

(d)

all of them

Which one of them is used to produce a propagating electromagnetic wave?

(a)

an accelerating charge

(b)

a charge moving at constant velocity

(c)

a stationary charge

(d)

an uncharged particle

If E = E_o sin[10⁶ x -ωt] be the electric field of a plane electromagnetic wave, the value of ω is_____.

(a)

0.3 x 10⁻¹⁴ rad s⁻¹

(b)

3 x 10⁻¹⁴ rad s⁻¹

(c)

0.3 x 10¹⁴ rad s⁻¹

(d)

3 x 10¹⁴ rad s^-1

Which of the following is NOT true for electromagnetic waves?

(a)

it transport energy

(b)

it transport momentum

(c)

it transport angular momentum

(d)

in vacuum, it travels with different speeds which depend on their frequency

The electric and magnetic fields of an electromagnetic wave are _____.

(a)

in phase and perpendicular to each other

(b)

out of phase and not perpendicular to each other

(c)

in phase and not perpendicular to each other

(d)

out of phase and perpendicular to each other

An e.m. wave is propagating in a medium with a velocity \(\vec{v}=v \hat{i}\). The instantaneous oscillating electric field of this e.m. wave is along + y-axis, then the direction of oscillating magnetic field of the e.m. wave will be along _____.

(a)

–y direction

(b)

–x direction

(c)

+z direction

(d)

–z direction

Fraunhofer lines are an example of ______ spectrum.

(a)

line emission

(b)

line absorption

(c)

band emission

(d)

band absorption