NEET Questions - Physics - Electromagnetic Waves

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A metallic solid sphere is placed in a uniform electric field. The lines of force follow the path(s) shown in figure as

1
2
3
4

The dimensional formula of $ l_0 E_0$ is

$ L^2 T^{-2} $
$ L^{-2} T^{2} $
$ L^1 T^{-1} $
$ L^{-1} T^{1} $

A plane electromagnetic wave is incident on a material surface. The wave delivers momentum P and energy E

$ P = 0 , E \neq 0 $
$ P \neq 0 , E = 0 $
$ P \neq 0 , E \neq 0 $
$ P = 0 , E = 0 $

If $ V_\gamma , V_x and V_m $ are the velocity of the v rays, x rays, micro waves respectively in space, then

$ V_\gamma \lt V_x \lt V_m $
$ V_\gamma = V_x = V_m $
$ V_\gamma \gt V_x \gt V_m $
$ V_\gamma \gt V_x \lt V_m $

According to Maxwell, a changing electric field produces

emf
Electric current
magnetic field
radiation pressure

An electromagnetic wave going through vaccum is described by $ E= E_o sin (kx - \omega t ) $ Which of the following is independent of the wavelength?

$ \omega $
$ k/ omega $
$ k \omega $
k

Which of the following have zero average value in a plane electromagnetic wave?

Electric energy
Magnetic energy
Electric field
None of these.

If the relative permeability and dielectric constant of a given medium are equal to $ l_r \,and K $ respectively, then the refractive index of the medium is equal to__________

$ \sqrt{l_r K } $
$ \sqrt { l_r E_0 } $
$ \sqrt { l_0 E_0 } $
$ 1 / \sqrt { l_r k } $

Astraonomers have found that electromagnetic waves of wavelength 21cm are continuously reaching the Earth’s surface . Calculate the frequency of this radia- tion $ ( c = 3 \times 10^8 m/s) $

14.28 GHz
1.428KHz
1.428MHz
1.428GHz

Electric field in an electromagnetic wave is given by $ E = 50 sin \omega ( t - (x/c )) NC^{-1} $ intensity of this wave is ___________ $Wm^-2$

50
$ 1.1 \times 10^{8} $
3.3
$ 5.5 \times 10^{-19} $

The amplitude of the electric field in a parallel beam of light of intensity $ 2.0 Wm-^2$ is

$ 38.8 NC^{-1} $
$ 19.4 NC^{-1} $
$ 9.7 NC^{-1} $
None of these

Speed of electromagnetic wave is the same

for all wavelengths
in all media
for all intensities
for all frequencies

The maximum electric field in a plane electromagnetic wave is $ 900 NC^{-1}$ . The wave is going in the x direction and the electric field is in the y direction. The maxi- mum magnetic field in the wave is ………….T

$ 3 \times 10^ {-8} $
$ 3 \times 10^ {-6} $
$ 27 \times 10^ {-6} $
$ 27 \times 10^ {10} $

Electromagnetic waves are produced by

a static charge
a moving charge
an accelerating charge
chargeless particles

Maxwells equations are derived from the laws of___________

electricity
magnetism
both electricity and magnetism
mechanics

NEET Physics Questions: Electromagnetic Waves