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Electromagnetic Waves 5 Mark Creative Question Paper With Answer Key

12th Standard

    Reg.No. :
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Physics

Time : 01:00:00 Hrs
Total Marks : 70

     5 Marks

    14 x 5 = 70
  1. Show how to generalize Ampere's circuital law to include the term due to displacement current?

  2. A parallel plate capacitor is charged by an external ac source straight the displacement current inside the capacitor is the same as the current charging the capacitor.

  3. In an Electromagnetic wave propagating along the X - direction, the magnetic field oscillates at a frequency. 5 x 108 Hz and has an amplitude of 10-7 tesla, acting along the Y-direction.
    (i) What is the wavelength of the wave?
    (ii) Write the expression representing the corresponding oscillating electric field.

  4. The oscillating magnetic field in a plane Electromagnetic wave is given by
    B = (8 x 10-6) sin (2 x 1011 t + 300 πx) T
    (i) Calculate the λ of Electromagnetic wave.
    (ii) Find the amplitude of electric field.

  5. In a plane Electromagnetic wave, the electric field oscillates sinusoidally at a frequency of 1.5 x 1010Hz with & an amplitude of 36 Vm-1.
    (i) What is the wavelength of a wave?
    (ii) What the amplitude of the oscillating magnetic field?
    (iii) Straight the average energy density of the electric field \(\left( \overrightarrow { E } \right) \), is equal to average energy density of the magnetic field \(\left( \overrightarrow { B } \right) \)

  6. The magnetic field amplitude of an Electromagnetic wave is 1.6 x 10-7 T. If the frequency is 30 MHz. determine electric field, any velocity K and λ.

  7. In an electric circuit, there is a capacitor of reactance 100 Ω connected across the source of 220 V, find the displacement current.

  8. In which way you can establish an instantaneous displacement current of 1.0 A in the space between the parallel plates of 1μf capacitor?

  9. An electromagnetic wave is traveling in vacuum with a speed 3 x 108 m/s. find its velocity in a medium having relative electric and magnetic permeability 2 and 1 respectively.

  10. A plane Electromagnetic wave travels in vacuum along z - direction. What can you say about the directions of electric and magnetic field vectors? If the frequency of the wave is 30 MHz. What is its wavelength?

  11. About 5 % of the power of a 100 W light bulb is connected to visible radiation. What is the average intensity of visible radiation at the distance of 1m from the bulb?

  12. Use the formula E = h૪ (for energy of a quantum of radiation photon) and obtain the photon energy in units of ev for different parts of the Electromagnetic spectrum. In what ways are the different scales of photon energies that you obtain related to the sources of Electromagnetic radiation?

  13. Explain the method of generation of magnetic field by changing electric field.

  14. Explain briefly. a) Ultra violet radiation b) Infra red radiation c) Gamma rays.

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