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Electromagnetic...

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  • Question 1
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    Which of the following is the correct expression for velocity of light?

  • Question 2
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    When a plane electromagnetic wave travels in vacuum, the average electric energy density is given by
    (Here, E0 is the amplitude of the electric field of the wave)

  • Question 3
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    Visible light is due to

  • Question 4
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    Which of the following pairs of space-time varying E = () and B = () would generate a plane electromagnetic wave travelling in the z-direction?

  • Question 5
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    Radio waves received by a radio telescope from distant stars may have a wavelength of about 0.20 m. If the speed of the waves is km s–1, then the frequency of the waves will be

  • Question 6
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    If B is the magnetic field, E is the electric field and c is the speed of light in an electromagnetic wave, then which of the following relations is correct?

  • Question 7
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    A new system of units is evolved in which the values of 0 and 0 are 2 and 8, respectively. The speed of light in this system will be

  • Question 8
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    Which of the following statements is false?

  • Question 9
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    The average energy flux of sunlight is 1.0 kWm-2. This energy (light) is falling normally on a plate surface of area 10 cm2, which completely absorbs the energy. How much force (in Newtons) is exerted on the plate if it is exposed to sunlight for 20 minutes?

  • Question 10
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    If and then equals (symbols have their usual meanings)

  • Question 11
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    A parallel plate capacitor of area 60 cm2 and separation 3 mm is charged initially to 90 C. If the medium between the plate gets slightly conducting and the plate loses the charge initially at the rate of 2.5 x 10-8 C/s, what is the magnetic field between the plates?

  • Question 12
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    The wavelength of light received from a galaxy is 5% greater than that received from an identical source on the earth. The velocity of the galaxy relative to earth is:

  • Question 13
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    The potential difference between the plates of a parallel plate capacitor is changing at the rate of 106 Vs-1. If the capacitance is 2 F, then the displacement current in the dielectric of the capacitor will be

  • Question 14
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    Displacement current flows in a dielectric of a capacitor when the potential difference across its plates

  • Question 15
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    Which of the following statements is correct in relation to electromagnetic waves in an isotropic medium?

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