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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

chargeless particle

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The correct Answer is:
C
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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.

CP SINGH-ELECTROMAGNETIC WAVES-EXERCISES
  1. Which of the following is correct regarding electromagnetic wave?

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  2. Electromagnetic waves are produced by

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  3. Speed of electromagnetic waves is the same

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  4. An em wave going through vacuum is described by E=E0sin(kx-omegat) B...

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  5. A plane electromagnetic wave is incident on a material surface. The wa...

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

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  7. Which of the following have zero average value un a plane electromagne...

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  8. Consider the following two statements regarding a linearly polarized, ...

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  9. The energy contained in a small volume through which an electromagneti...

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

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  11. Choose the correct option

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  12. The electric and the magnetic field, associated with an e.m. wave prop...

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  13. An electromagnetic wave travel along z-axis. Which of the following pa...

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  14. The frequencies of X-rays, gamma-rays and ultraviolet rays are respect...

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  15. The oscillating electric and magnetic vectors of an electromagnetic wa...

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  16. An electromagnetic wave in vacuum has the electric and magnetic field ...

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  17. The electric field associted with an electromagnetic wave in vacuum is...

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  18. The magnetic field amplitude of an electromagnetic wave is 2 xx 10^(-7...

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  19. The rms value of the electric field of the light from the sun is 720 N...

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  20. If the total electromagnetic energy falling on a surface is U then the...

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