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Electromagnetic waves are produced by...

Electromagnetic waves are produced by

A

a static charge ,

B

a moving charge

C

an accelerating charge

D

charge less particles.

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The correct Answer is:
B
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A charged particle oscillates about its mean equilibrium position with a frequency of 10^(9) Hz. The frequency of electromagnetic waves produced by the oscillator is

When charge is at rest then it creates only electric field not the magnetic field. A moving charge generates electric as well as magnetic field around it. If charge is moving with constant velocity then electric and magnetic field do not change with time, hence, it cannot produce electromagnetic wave. When charge is accelerated then time-varying electric and magnetic fields are created and thus electromagnetic wave is produced by accelerated charge. We know that the current-carrying wire creates magnetic field around it. If alternating current is flowing through the wire then it creates variable magnetic field around it and thus starts radiating electromagnetic waves. When a charged capacitor is connected across an inductor then charge starts oscillating between the plates of the capacitor. Normally one plate of the capacitor is connected to Earth and the other plate is connected to an antenna. Antenna radiates electromagnetic wave. Hertz successfully produced electromagnetic waves using such LC oscillator. Speed of electromagnetic wave in vacuum is constant and equal to 3 xx 10^8 m/s. But inside a medium the speed changes according to electrical and magnetic properties of the medium. IF mu_r and epsi_r are the relative permeability and relative premittivity of the medium then speed of light in that medium can be written as

A : High frequency electromagnetic waves are detected by some means based on physical effects they produce on interacting with matter. R : The oscillating fields of an electromagnetic wave can accelerate charges and can produce oscillating currents therefore, an apparatus designed to detect EM waves is based on this fact.

FIITJEE-ELECTROMAGNETIC WAVE & WAVE OPTICS-ASSIGNMENT PROBLEMS Objective : Level-I (MULTI CHOICE SINGLE CORRECT)
  1. A diffraction pattern is obtained using a beam of redlight. What happe...

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  2. Light of wavelength lamda is incident on a slit of width d. the result...

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  3. Yellow light is used in a single slit diffraction experiment with slit...

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  4. A parallel monochromatic beam of light is incident normally on a narro...

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  5. When a plane polarised light is passed through an analyser and analyse...

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  6. An unpolarised light is incident upon a glass plate of refractive inde...

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  7. Two 'crossed' polaroids A and B are placed in the path of a light-beam...

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  8. The path difference equivalent to a phase difference of 180^(@) (given...

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  9. For diffraction to be observed, the main condition is

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  10. Electromagnetic waves are produced by

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  11. An electromagnetic wave going through vacuum is described by E= E0 s...

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  12. The amplitudes of electric and magnetic fields are related to each oth...

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  13. An accelerated charge produces

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  14. Ozone layer blocks the radiaitons of wave length

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  15. There are three wavelengths, 10^(6)m, 10^(-10) m and 10^(-7) m find th...

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  16. An electric field (vec E) and a magnetic field (vec B)exist in a regio...

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  17. The speed of electromagnetic waves in vacuum is - (A) sqrt(in0mu0) (B...

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  18. A free electrons is placed in the path of a plane electromagnetic wave...

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  19. An electromagnetic wave going through vacuum is described by E= E0 s...

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  20. A reflecting surface is represented by the equation y = (2L)/(pi) si...

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