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NEETPhysicsElectromagnetic Waves

The electric field of an electromagnetic wave propagating in a vacuum is given by the equation: E = E₀ (kz - t) i Which of the following describes the state of motion of the source charge that could have produced this wave?

Options

  1. AMoving with a uniform velocity along the z-axis
  2. BOscillating along the y-axis with a frequency of 2
  3. COscillating along the x-axis with a frequency of
  4. DOscillating along the x-axis with a frequency of 2

Correct answer

D. Oscillating along the x-axis with a frequency of 2

Step-by-step solution

An electromagnetic wave is produced by an accelerating or oscillating charge, not by a charge moving with uniform velocity. Thus, the source charge must be oscillating. The given electric field equation E = E₀ (kz - t) i indicates that the wave propagates along the z-axis and the electric field oscillates along the x-axis (due to the i direction). Since the electric field of the radiated wave is parallel to the direction of acceleration of the source charge, the charge must be oscillating along the x-axis. The angu

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