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Class 12 Physics
Electromagnetic Waves
Quiz 1
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The dimensional formula of \(\vec{E}\) is:
0%
[MLT
-2
A
-1
]
0%
[MLT
-3
A
-1
]
0%
[MLT
-2
A
-2
]
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None of these
Explanation
[MLT
-3
A
-1
]
The dimensional formula of is:
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[MLT
-2
A
-1
]
0%
[ML
0
T
-2
A
-1
]
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[ML
0
T
-3
A
-1
]
0%
None of these
Explanation
[ML
0
T
-2
A
-1
]
Which of the following has the dimensions of current?
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ε
0
\(\vec{E}\).\(\vec{dt}\)
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µ
0
\(\vec{E}\).\(\vec{dt}\)
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\(\frac{\vec{B}.\vec{dl}}{µ_0}\)
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\(\frac{\vec{B}.\vec{dl}}{ε_0}\)
Explanation
\(\frac{\vec{B}.\vec{dl}}{µ_0}\)
Which of the following has the dimensions of charge?
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\(\frac{ε_0\vec{E}}{\vec{ds}}\)
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µ
0
[latex]\vec{E}\).\(\vec{ds}\)
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\(\frac{ε_0}{µ_0}\) \(\vec{E}\).\(\vec{ds}\)
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\(\frac{µ_0}{ε_0}\) \(\vec{E}\).\(\vec{ds}\)
Explanation
\(\frac{ε_0\vec{E}}{\vec{ds}}\)
Maxwell's equation involving \(\frac{d}{dt}\) \(\vec{B}\) is obtained-from:
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Ampere's law
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Gauss's law
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Faraday's law
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Biot-Savart's law
Explanation
Faraday's law
The dimensions of \(\vec{E}\), \(\vec{dl}\) are identical to that of:
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potential
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charge
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current
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None of these
Explanation
potential
Which of the following laws was modified by Maxwell by introducing the displacement current?
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Gauss's law
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Ampere's law
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Biot-Savart's law
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None of these
Explanation
Ampere's law
Choose the wave relevant to telecommunication :
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ultraviolet
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infrared
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microwave
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visible light
Explanation
microwave
Electromagnetic waves have a speed of
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3 × 10
5
kms
-1
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3 × 10
6
kms
-1
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3 × 10
7
kms
-1
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3 × 10
8
kms
-1
Explanation
3 × 10
5
kms
-1
Which of the following EMW has highest wavelength?
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X-ray
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ultraviolet rays
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infrared rays
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microwaves
Explanation
infrared rays
Displacement current is due to:
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the flow of electrons
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the Varying electric field
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the ionization of atmosphere
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the flow of protons
Explanation
the Varying electric field
Displacement current is always :
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equal to conduction current
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less than conduction current
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greater than conduction current
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the sum of current due to flow of positive and negative ions
Explanation
equal to conduction current
EMW are produced by:
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charge in uniform motion only
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charge at rest only
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accelerated or decelerated charge only
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all of the above
Explanation
accelerated or decelerated charge only
Who first demonstrated the existence of em waves?
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Hertz
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Maxwell
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Ampere
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Faraday
Explanation
Hertz
If \(\vec{B}\) is the magnetic field vector and \(\vec{E}\) is the electric field vector in an em wave, then which of the following relations is correct? Here c is the speed of fight:
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c = \(\frac{E}{B}\)
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c = BE
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c = \(\frac{B}{E}\)
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c = \(\frac{1}{EB}\)
Explanation
c = \(\frac{E}{B}\)
The dimensions of E/Bare same as that of:
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charge
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current
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velocity
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acceleration
Explanation
velocity
Name the law which states that a varying electric field produces a magnetic field:
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Biot-Savart’s law
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Faraday's law
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Modified Ampere's law
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None of these
Explanation
Modified Ampere's law
The existence of EMW was experimentally established by :
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Sir S. C. Bose
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Maxwell
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Marconi
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Hertz
Explanation
Sir S. C. Bose
An EMW of v = 3 MHz passes from vacuum into dielectric medium with permittivity E
r
= 4, then:
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Wavelength is doubled and the frequency remains unchanged
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Wavelength is doubled and the frequency become half
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Wavelength is halved and the frequency remains unchanged
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Wavelength and frequency both remain unchanged
Explanation
Wavelength is halved and the frequency remains unchanged
Frequency of a wave is 6 × 10
15
. Hz. The wave is :
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Radiowave
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Microwave
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X-ray
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Ultra violet
Explanation
Ultra violet
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