Question

At a certain instant in time, the electric field of an
electromagnetic wave in free space points in the -*z*
direction, and the magnetic field points in the +*y*
direction. In what direction is this wave traveling?

A) +*x* direction ___B) -*x* direction ___ C)
+*y* direction ___D) -*z* direction ___E) +*z*
direction ___

Please explain why you chose your answer

Answer #1

If the magnetic field of an electromagnetic wave is in the
+-direction and the electric field of the wave is in the
+-direction, the wave is traveling in the
-x-direction.
-y-direction.
+z-direction.
xy-plane.
-z-direction.

Problem 1
An electromagnetic wave propagates along the +y direction. If
the electric field at the origin is along the +z direction, what is
the direction of the magnetic field
2
If an electromagnetic wave has components Ey = E0 sin(kx - ?t)
and Bz = B0 sin(kx - ?t), in what direction is it traveling?

A plane electromagnetc sinusoidal wave of frequency 40 MHz
tavels free space in the x-direction. at some point and at some
instant, the electric field E has its maximum
value of 700 N/C and is along the y-axis. (a.) draw an illustration
of the electromagnetic wve in a coordinate system, and determine
the wavelength and period of the wave. (b.) calculate the magnitude
and direction of the magnetic field B when E= 700
N/C in the x-direction. (c) what is...

An electromagnetic wave is traveling straight down toward the
center of the Earth. At a certain moment in the time the electric
field ponts east. In which direction does the magnetic field point
at this moment? Explain your reasoning.

A linearly-polarized sinusoidal electromagnetic wave propagates
in the –x direction. At a particular moment in time, the magnetic
field at point (–4, 0, 0) points in the –z direction. At that same
moment at (–4, 0, 0), what is the direction of the electric field?
Drawing a diagram should help. Group of answer choices –z direction
+z direction +y direction –y direction

At some instant and location, the electric field associated with
an electromagnetic wave in vacuum has the strength 99.3 V/m. Find
the magnetic field strength ?, the total energy density ?, and the
power flow per unit area, all at the same instant and location.

The magnetic field is given by By = Bo sin(kz - ωt). If the
electromagnetic wave with a wavelength of 650nm is traveling in the
z direction, and the maximum magnetic field is 8mT
a. What is the Electric Field? (show trigonometric form)
b. What is the maximum Electric Field
c. What is the wave number?
d. What is the frequency?
e. Write out the Poynting vector and calculate the magnitude

At
some instant and location the electric field associated with an
electromagnetic wave in vacuum has the strength 87.5 V/m. Find the
magnetic field strength (T), the energy density (J/m3), and the
power flow per unit area (W/m2), all at the same instant and
location.

At one instant, the electric and magnetic fields at one point of
an electromagnetic wave are E?
=(220i^+300j^?60k^)V/m and B?
=(7.8i^?7.3j^+ak^)B0.
1) What is the value of a?
2) What is the value of B0?
3) What is the Poynting vector at this time and position? Find
the x-component.
4)Find the y-component.
5) Find the z-component.

Consider a sinusoidal electromagnetic wave propagating in the +x
direction, whose electric field is parallel to the y axis. The wave
has wavelength 475 nm, and the electric field has amplitude 3.20 x
10^-3 V m-1. What is the frequency of the wave? What is the
amplitude of the magnetic field? What are the vector equations for
E(x,t) and B(x,t)?

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