Ampere’s circuital law was modified by:
1.Laplace
2.Gauss
3.Maxwell
4.Hertz
An EMW of v = 3 MHz passes from vacuum into dielectric medium with permittivity Er = 4, then:
1.Wavelength is doubled and the frequency remains unchanged
2.Wavelength is doubled and the frequency become half
3.Wavelength is halved and the frequency remains unchanged
4.Wavelength and frequency both remain unchanged
Choose the wave relevant to telecommunication :
1.ultraviolet
2.infrared
3.microwave
4.visible light
Choose the wrong statement?
1.Electromagnetic waves are transverse
2.Electromagnetic waves travel with the speed of light in free space
3.Electromagnetic waves are produced by accelerating charges
4.Electromagnetic waves travel with the same speed in all media
Displacement current is always :
1.equal to conduction current
2. less than conduction current
3.greater than conduction current
4. the sum of current due to flow of positive and negative ions
Displacement current is due to:
1.the flow of electrons
2.the Varying electric field
3.the ionization of atmosphere
4.the flow of protons
Electromagnetic waves have a speed of
1.(a) 3 × 105 kms-1
2.3 × 106 kms-1
3.3 × 107 kms-1
4.3 × 108 kms-1
EMW are produced by:
1.charge in uniform motion only
2.charge at rest only
3.accelerated or decelerated charge only
4.All the above
Frequency of a wave is 6 × 1015. Hz. The wave is :
1.Radiowave
2.Microwave
3.X-ray
4.Ultra violet
Light Year is the unit of:
1.distance
2.time
3.energy
4.intensity of light
Name the law which states that a varying electric field produces a magnetic field:
1.Biot-Savart’s law
2.Faraday’s law
3.Modified Ampere’s law
4.None of the above
Solar radiation is :
1.transverse EMW
2. longitudinal EMW
3.Both of the above
4.None of the above
The dimensional formula of E⃗ is:
1.[MLT-2A-1]
2. [MLT-3A-1]
3.[MLT-2A-2]
4.None of the above
The dimensional formula of is
1. [MLT-2A-1]
2.[ML0T-2A-1]
3.[ML0T-3A-1]
4.None of the above
The dimensions of E/Bare same as that of:
1.charge
2.current
3.velocity
4.acceleration
The existence of EMW was experimentally established by :
1.Sir S. C. Bose
2.Maxwell
3.Marconi
4.Hertz
Which of the following EMW has highest wavelength?
1. X-ray
2.ultraviolet rays
3.infrared rays
4.microwaves
Which of the following laws was modified by Maxwell by introducing the displacement current?
1.Gauss’s law
2.Ampere’s law
3.Biot-Savart’s law
4.None of the above
Who first demonstrated the existence of em waves?
1.Hertz
2.Maxwell
3.Ampere
4.Faraday