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Important Questions for "electromagnetic theory":

[1]

  1. Explain Biot-Savart law with a rough diagram and meanings of symbols used.
  2. Through what angle should one polaroid be rotated to reduce the intensity to one-fourth when two polaroids are adjusted for maximum intensity?
  3. Prove Biot-Savart law and derive an expression for the magnetic field intensity at a distance r from a straight current-carrying wire of finite length. What will be the magnetic field intensity when length is very long?

[2]

  1. What do you understand by Lorentz Force?
  2. What is meant by impedance of an electric circuit? What is a linear impedance?
  3. Write Biot-Savart's law. Use it to obtain the expression for the magnetic field at the center of a current circular coil.

[3]

  1. What is displacement current? Write down its characteristics.
  2. Explain electric and magnetic dipoles.
  3. For transverse electric waves perfectly propagating in a rectangular wave guide with perfectly conducting walls, find cutoff frequency.

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