EM Waves True or False ________(a) An electromagnetic wave is caused by an accel
ID: 1615320 • Letter: E
Question
EM Waves True or False
________(a) An electromagnetic wave is caused by an accelerated motion of an electric charge.
_______(b) Since an electromagnetic (EM) wave is a transverse wave, the direction of the movement of the particles in the medium in which an EM wave propagates must be perpendicular to the direction of the propagation of the EM wave.
_______(c) If an EM wave described by the wave function, , then the direction of the propagation of the EM wave is possible along the positive y direction.
_______(d) For the EM wave with the given direction of propagation in part (c) above, the direction of the electric field is possible along the negative z direction.
_______(e) Again, for the EM wave in part (c), the magnitude of the magnetic field is directly proportional to the electric field in a given medium.
Explanation / Answer
(a)
EM wave is caused due to accelerated motion of charges and changing currents.
So, the statement is TRUE.
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(b)
EM wave is a tranverse wave, which means the magnetic and electric fields associated with the wave will be in a direction perpendicular to the motion of the wave. But if there is a charged particle in the way of an EM wave, it can move in a direction parallel to the motion of the wave as force due to magnetic field is perpedicular to the velocity of the particle and magntice field.
Hence, the statement is FALSE.
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(c)
An EM wave can move in any direction. So, it can have direction along positive y-axis.
Hence, the statement is TRUE.
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(d)
If EM wave moves along y-axis, the electric field can have any direction in the x-z plane. So the electric field can be along negative z direction.
Hence, the statement is TRUE.
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