The dimensional formula of \(\vec{E}\) is:
  • [MLT-2A-1]
  • [MLT-3A-1]
  • [MLT-2A-2]
  • None of these
The dimensional formula of is:
  • [MLT-2A-1]
  • [ML0T-2A-1]
  • [ML0T-3A-1]
  • None of these
Which of the following has the dimensions of current?
  • ε0 \(\vec{E}\).\(\vec{dt}\)
  • µ0 \(\vec{E}\).\(\vec{dt}\)
  • \(\frac{\vec{B}.\vec{dl}}{µ_0}\)
  • \(\frac{\vec{B}.\vec{dl}}{ε_0}\)
Which of the following has the dimensions of charge?
  • \(\frac{ε_0\vec{E}}{\vec{ds}}\)
  • µ0 [latex]\vec{E}\).\(\vec{ds}\)
  • \(\frac{ε_0}{µ_0}\) \(\vec{E}\).\(\vec{ds}\)
  • \(\frac{µ_0}{ε_0}\) \(\vec{E}\).\(\vec{ds}\)
Maxwell's equation involving \(\frac{d}{dt}\) \(\vec{B}\) is obtained-from:
  • Ampere's law
  • Gauss's law
  • Faraday's law
  • Biot-Savart's law
The dimensions of \(\vec{E}\), \(\vec{dl}\) are identical to that of:
  • potential
  • charge
  • current
  • None of these
Which of the following laws was modified by Maxwell by introducing the displacement current?
  • Gauss's law
  • Ampere's law
  • Biot-Savart's law
  • None of these
Choose the wave relevant to telecommunication :
  • ultraviolet
  • infrared
  • microwave
  • visible light
Electromagnetic waves have a speed of
  • 3 × 105 kms-1
  • 3 × 106 kms-1
  • 3 × 107 kms-1
  • 3 × 108 kms-1
Which of the following EMW has highest wavelength?
  • X-ray
  • ultraviolet rays
  • infrared rays
  • microwaves
Displacement current is due to:
  • the flow of electrons
  • the Varying electric field
  • the ionization of atmosphere
  • the flow of protons
Displacement current is always :
  • equal to conduction current
  • less than conduction current
  • greater than conduction current
  • the sum of current due to flow of positive and negative ions
EMW are produced by:
  • charge in uniform motion only
  • charge at rest only
  • accelerated or decelerated charge only
  • all of the above
Who first demonstrated the existence of em waves?
  • Hertz
  • Maxwell
  • Ampere
  • Faraday
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:
  • c = \(\frac{E}{B}\)
  • c = BE
  • c = \(\frac{B}{E}\)
  • c = \(\frac{1}{EB}\)
The dimensions of E/Bare same as that of:
  • charge
  • current
  • velocity
  • acceleration
Name the law which states that a varying electric field produces a magnetic field:
  • Biot-Savart’s law
  • Faraday's law
  • Modified Ampere's law
  • None of these
The existence of EMW was experimentally established by :
  • Sir S. C. Bose
  • Maxwell
  • Marconi
  • Hertz
An EMW of v = 3 MHz passes from vacuum into dielectric medium with permittivity Er = 4, then:
  • Wavelength is doubled and the frequency remains unchanged
  • Wavelength is doubled and the frequency become half
  • Wavelength is halved and the frequency remains unchanged
  • Wavelength and frequency both remain unchanged
Frequency of a wave is 6 × 1015. Hz. The wave is :
  • Radiowave
  • Microwave
  • X-ray
  • Ultra violet
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