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NEET Questions / Physics / Electromagnetic Waves / Relation Between E And B
The electric field E and magnetic field B in an electromagnetic wave are related. In a vacuum, which of the following is true?
E and B are parallel to each other and to the direction of propagation.
E and B are perpendicular to each other but parallel to the direction of propagation.
E and B are parallel to each other and perpendicular to the direction of propagation.
E and B are perpendicular to each other and to the direction of propagation.
In an electromagnetic wave, the ratio of the magnitude of the electric field (E) to the magnitude of the magnetic field (B) is equal to:
The permeability of free space ()
The permittivity of free space ()
The speed of light (c)
Zero
If the electric field in an electromagnetic wave is given by , what is the direction of propagation of the wave?
Positive x-direction
Negative x-direction
Positive y-direction
Negative y-direction
Which of the following is NOT a property of electromagnetic waves?
They are transverse waves.
They travel at the speed of light in a vacuum.
They can be polarized.
They require a medium to propagate.
In an electromagnetic wave, if the electric field oscillates along the y-axis and the wave propagates along the z-axis, along which axis does the magnetic field oscillate?
x-axis
y-axis
z-axis
None of these
A charged particle moves with a velocity in a region where both electric field and magnetic field are present. The particle experiences no net force. Which of the following conditions must be true?
is parallel to , and
is perpendicular to , and
is parallel to , and
is perpendicular to , and
An electron enters a region of uniform magnetic field with velocity perpendicular to . The electron moves in a circular path of radius . If the velocity of the electron is doubled, what happens to the radius of the path?
The radius is halved
The radius doubles
The radius quadruples
The radius remains the same
In an electromagnetic wave, the electric and magnetic fields are:
parallel to each other and to the direction of propagation
perpendicular to each other and to the direction of propagation
parallel to each other but perpendicular to the direction of propagation
perpendicular to each other but parallel to the direction of propagation
The ratio of the electric field amplitude to the magnetic field amplitude in an electromagnetic wave in free space is equal to:
one
the speed of light
the permeability of free space
the permittivity of free space