Ampere’s circuital law was modified by:
1.Laplace
2.Gauss
3.Maxwell
4.Hertz
Posted Date:-2021-12-17 01:14:40
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
Posted Date:-2021-12-17 01:11:23
Choose the wave relevant to telecommunication :
1.ultraviolet
2.infrared
3.microwave
4.visible light
Posted Date:-2021-12-17 00:58:17
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
Posted Date:-2021-12-17 01:12:58
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
Posted Date:-2021-12-17 01:02:35
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
Posted Date:-2021-12-17 01:00:53
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
Posted Date:-2021-12-17 00:59:09
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
Posted Date:-2021-12-17 01:03:56
Frequency of a wave is 6 × 1015. Hz. The wave is :
1.Radiowave
2.Microwave
3.X-ray
4.Ultra violet
Posted Date:-2021-12-17 01:12:11
Light Year is the unit of:
1.distance
2.time
3.energy
4.intensity of light
Posted Date:-2021-12-17 01:15:24
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
Posted Date:-2021-12-17 01:06:43
Solar radiation is :
1.transverse EMW
2. longitudinal EMW
3.Both of the above
4.None of the above
Posted Date:-2021-12-17 01:13:51
The dimensional formula of E⃗ is:
1.[MLT-2A-1]
2. [MLT-3A-1]
3.[MLT-2A-2]
4.None of the above
Posted Date:-2021-12-16 11:23:15
The dimensional formula of is
1. [MLT-2A-1]
2.[ML0T-2A-1]
3.[ML0T-3A-1]
4.None of the above
Posted Date:-2021-12-17 00:54:28
The dimensions of E/Bare same as that of:
1.charge
2.current
3.velocity
4.acceleration
Posted Date:-2021-12-17 01:05:46
The existence of EMW was experimentally established by :
1.Sir S. C. Bose
2.Maxwell
3.Marconi
4.Hertz
Posted Date:-2021-12-17 01:07:30
Which of the following EMW has highest wavelength?
1. X-ray
2.ultraviolet rays
3.infrared rays
4.microwaves
Posted Date:-2021-12-17 00:59:54
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
Posted Date:-2021-12-17 00:55:39
Who first demonstrated the existence of em waves?
1.Hertz
2.Maxwell
3.Ampere
4.Faraday
Posted Date:-2021-12-17 01:04:38