MCQs of Electromagnetic Waves

Showing 91 to 100 out of 112 Questions

91.

The electric field associated with an emf wave in vacuum is given by

\vec{E} = \overset{\land}{i} 40 \cos (k z - 6 \times 10^{8} t)

Where E, z and t are in volt/m, meter and seconds respectively. The value of wave vector k is _____ .

92.

The magnetic field in a travelling electromagnetic wave has a peak value of 20 nT . The peak value of electric field strength is _____ .

93.

During the propagation of electromagnetic waves in a medium _____ .

(a)	electric energy density is half of the magnetic energy density
(b)	electric energy density is equal to the magnetic energy density
(c)	both electric and magnetic energy densities are zero
(d)	electric energy density is double of the magnetic energy density

94.

In which form the missing link in the differential equations of electromagnetic waves were provided ?

95.

Give the equation which represents law of Gauss for magnetism.

(a)	$\oint \vec{E} \cdot \vec{d a} = \frac{q}{ε_{0}}$
(b)	$\oint \vec{B} \cdot \vec{d a} = 0$
(c)	$\oint \vec{E} \cdot \vec{d l} = \frac{d Φ_{B}}{d t}$
(d)	$\oint \vec{E} \cdot \vec{d l} = μ_{0} (i_{c} + i_{d})$

96.

\oint \vec{B} \cdot \vec{d l} = μ_{0} i

+ _____ .

97.

In Hertz experiment the _____ acts as a capacitor.

98.

Electromagnetic waves are _____ .

(a)	mechanical and transverse
(b)	non - mechanical and lingitudinal
(c)	non - mechanical and transverse
(d)	mechanical and longitudinal

99.

The SI unit of displacement current is _____ .

100.

The radiated components in Hertz experiment are those components which are _____ .

Showing 91 to 100 out of 112 Questions