Advertisements
Advertisements
प्रश्न
How does a charge q oscillating at certain frequency produce electromagnetic waves?
Sketch a schematic diagram depicting electric and magnetic fields for an electromagnetic wave propagating along the Z-direction.
उत्तर
An oscillating charge is an example of accelerated charge. We know from Maxwell’s theory that accelerated charge radiates electromagnetic waves. These electromagnetic waves are produced because oscillating charge produces oscillating magnetic field, which in turn produces an oscillating electric field. This process goes on, giving rise to an electromagnetic wave.
APPEARS IN
संबंधित प्रश्न
How is the speed of em-waves in vacuum determined by the electric and magnetic field?
Define frequency modulation and state any one advantage of frequency modulation (FM) over amplitude modulation (AM).
State any one property which is common to all electromagnetic waves.
Write down Maxwell equations in integral form.
Explain the importance of Maxwell’s correction.
For a plane electromagnetic wave propagating in the x-direction, which one of the following combinations gives the correct possible directions for the electric field (E) and magnetic field (B) respectively?
An EM wave radiates outwards from a dipole antenna, with E0 as the amplitude of its electric field vector. The electric field E0 which transports significant energy from the source falls off as ______.
A charged particle oscillates about its mean equilibrium position with a frequency of 109 Hz. The electromagnetic waves produced ______.
- will have frequency of 109 Hz.
- will have frequency of 2 × 109 Hz.
- will have a wavelength of 0.3 m.
- fall in the region of radiowaves.
A plane EM wave travelling along z direction is described by `E = E_0 sin (kz - ωt)hati` and `B = B_0 sin (kz - ωt)hatj`. show that
- The average energy density of the wave is given by `u_(av) = 1/4 ε_0E_0^2 + 1/4 B_0^2/mu_0`.
- The time averaged intensity of the wave is given by `I_(av) = 1/2 cε_0 E_0^2`.
The ratio of the magnitudes of the electric field and magnetic field of a plane electromagnetic wave is ______.
