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प्रश्न
How are electromagnetic waves produced?
उत्तर
Moving charges produce electric and magnetic field waves, which are then combined to form electromagnetic waves. All electromagnetic waves originate from charged particles. An electric field produced by this charged particle can act as a force on other adjacent charged particles. The charged particle produces a magnetic field and ripples or oscillations in its electric field as it accelerates as part of an oscillatory motion, as predicted by Maxwell's equations. Once a charged particle is in motion, the electric and magnetic fields it generates are self-replicating, with changes in either field (electric or magnetic) causing changes in the other. An electromagnetic wave's electric and magnetic fields will both vary over time, with one influencing the other. Any time a charged particle experiences a change in velocity, electromagnetic waves (photons) are generated. Energy is conserved via the electromagnetic wave (radiation) that is created when the charged particle changes its velocity. Light makes up this energy. Microwave oven manufacturing is a straightforward illustration of this. A magnetron is a part found within a microwave. A cavity that functions as an electron racecourse is located inside the magnetron. The electrons move extremely quickly over this little circular track. The electrons are moving back and forth towards the inside and outside of the racing track while they are moving at these extremely high speeds and in little circles. Microwaves are produced as a result of this high-frequency wriggling.
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संबंधित प्रश्न
Draw a schematic sketch of the electromagnetic waves propagating along the + x-axis. Indicate the directions of the electric and magnetic fields
The electric and magnetic fields, associated with an electromagnetic wave, propagating along negative X-axis can be represented by ______.
In an electromagnetic wave in free space the rms value of the electric field is 3 V m-1. The peak value of the magnetic field is ______.
Give two uses of Microwaves.
Explain the Maxwell’s modification of Ampere’s circuital law.
A pulse of light of duration 10-6 s is absorbed completely by a small object initially at rest. If the power of the pulse is 60 x 10-3 W, calculate the final momentum of the object.
Which of these mechanisms can be used to produce electromagnetic waves?
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?
A plane electromagnetic wave propagating along x direction can have the following pairs of E and B.
- Ex, By.
- Ey, Bz.
- Bx, Ey.
- Ex, By.
Professor C.V Raman surprised his students by suspending freely a tiny light ball in a transparent vacuum chamber by shining a laser beam on it. Which property of EM waves was he exhibiting? Give one more example of this property.
