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Electromagnetic Waves · Question 33

AIPMT 2011 (Prelims)MCQEasy📈 Topic in 25% papers+4−1
1

The electric and the magnetic field, associated with an e.m. wave, propagating along the +z-axis, can be represented by

  1. E = E0 i, B = B0 j
  2. E = E0 k, B = B0 i
  3. E = E0 j, B = B0 i
  4. E = E0 j, B = B0 k

Answer

(1) E = E0 i, B = B0 j

Solution

In an e.m. wave, E and B are perpendicular to each other and to the direction of propagation, which is along E B.

(1) i j = k → propagation along +z ✓

(2), (4) have a field along the z-axis, i.e. along the direction of propagation → not possible

(3) j i = - k → propagation along −z

Answer: (1)

AIPMT 2011 (Prelims)

Keep practising — Electromagnetic Waves

2

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

  1. microwave, infrared, ultraviolet, gamma rays
  2. gamma rays, ultraviolet, infrared, microwaves
  3. microwaves, gamma rays, infrared, ultraviolet
  4. infrared, microwave, ultraviolet, gamma rays
AIPMT 2011 (Prelims)
3

The electric field of an electromagnetic wave in free space is given by E = 10 (107t + kx ) j V/m, where t and x are in seconds and metres respectively. It can be inferred that Which one of the following pairs of statements is correct ?

  1. C and D only
  2. A and B only
  3. B and C only
  4. A and C only
AIPMT 2010 (Mains)
4

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

  1. Both electric and magnetic field vectors attain the maxima and minima at the same place and same time.
  2. The energy in electromagnetic wave is divided equally between electric and magnetic vectors.
  3. Both electric and magnetic field vectors are parallel to each other and perpendicular to the direction of propagation of wave.
  4. These waves do not require any material medium for propagation.
AIPMT 2010 (Prelims)
5

The electric field part of an electromagnetic wave in a medium is represented by Ex = 0; Ey = 2.5 NC [ (2 106 rads )t - ( 10-2 radm )x ]; Ez = 0. The wave is

  1. moving along x direction with frequency 106 Hz and wavelength 100 m.
  2. moving along x direction with frequency 106 Hz and wavelength 200 m.
  3. moving along -x direction with frequency 106 Hz and wavelength 200 m.
  4. moving along y direction with frequency 2 106 Hz and wavelength 200 m.
AIPMT 2009
6

The velocity of electromagnetic radiation in a medium of permittivity 0 and permeability 0 is given by

  1. 1 0 0
  2. 0 0
  3. 0 0
  4. 0 0
AIPMT 2008
7

The electric and magnetic field of an electromagnetic wave are

  1. in opposite phase and perpendicular to each other
  2. in opposite phase and parallel to each other
  3. in phase and perpendicular to each other
  4. in phase and parallel to each other
AIPMT 2007
8

If v, x and m represent the wavelengths of visible light, X-rays and microwaves respectively, then

  1. m > x > v
  2. m > v > x
  3. v > x > m
  4. v > m > x
AIPMT 2005
9

We consider the radiation emitted by the human body. Which one of the following statements is true?

  1. The radiation emitted is in the infra-red region
  2. The radiation emitted only during the day
  3. The radiation is emitted during the summers and absorbed during the winters
  4. The radiation emitted lies in the ultraviolet region and hence is not visible
AIPMT 2003
10

Which of the following rays are not electromagnetic waves?

  1. X-rays
  2. -rays
  3. -rays
  4. heat rays
AIPMT 2003
11

The velocity of electromagnetic wave is parallel to

  1. B E
  2. E B
  3. E
  4. B
AIPMT 2002

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