Question

How much energy is transported across a 1.50 cm2 area per hour by an EM wave whose E field has an rms strength of 33.8 mV/m ? The wave travels in free space.

Answer #1

The E⃗ field in an EM wave in free space has a peak of 22.9
mV/m
What is the average rate at which this wave carries energy
across unit area per unit time?

In an EM wave traveling west, the B field oscillates up and down
vertically and has a frequency of 92.0 kHz and an rms strength of
7.65×10−9T. Assume that the wave travels in free space. What is the
rms strength of the electric field?

What is the total energy transported per hour along a narrow
cylindrical laser beam 2.00 mm in diameter, whose B-field has an
rms strength of 1.10 ×10−10 T ?

What is the maximum total energy density of an EM wave, whose
electric field component has a rms magnitude of 1.27×103
N/C and a maximum magnetic field of 6.00×10−6 T

Information: A sinusoidal EM wave emitted by a radio tower has a
frequency of 750 megahertz. The root-mean-square magnetic field
strength of the wave at a distance of 1.00-km from the tower is
5.5*10^-10 T. wavelength = 0.40m Electric field strength amplitude
of the wave = 0.233V/m Intensity of the wave = 7.22*10^-5
Question: Assuming these waves easily penetrate your body( they
do) how much energy is contained inside your body due to these
waves at any given time if...

A
radio station broadcasts at 810 kHz. A.) What is the wavelength of
the radio waves? B.) If the magnetic field of an EM wave from the
radio station has a peak value of 5.44x10^(-9), what is the peak
value of the electric field? C.) How much energy is transported by
this wave across 30.0cm^2 in one hour?

Two parallel plates of 120 cm2 are connected to a battery that
provides them with a voltage of 12 volts. The plates are separated
by a 1.0 mm thick layer of air. If the space between the plates is
filled with oil, with a dielectric constant it is 4 and a
dielectric strength of 12x106 v / m; and then the battery stays
connected:
a) How much is the capacitance?
b) How much is the voltage across the capacitor? Explain...

6.6. A plane electromagnetic wave is travelling in a
non-magnetic medium whose relative permittivity (for field
variations of the frequency of the wave) is 4.
(a) Calculate the refractive index of the medium and the
velocity of wave propagation.
(b) If the amplitude of the E vector associated with the wave is
10 volt m-1 calculate the amplitude of B and show the
relative direction of E, B and the direction of the propagation in
a diagram.
(c) How much...

A plane electromagnetic wave varies sinusoidally at 98.2 MHz as
it travels through vacuum along the positive x direction.
The peak value of the electric field is 2.10 mV/m, and it is
directed along the positive y direction.
(a) Find the wavelength.
m
(b) Find the period.
ns
(c) Find the maximum value of the magnetic field.
pT
(d) Write expressions in SI units for the space and time variations
of the electric field. (x is in meters, and t...

Suppose a 20-kW radio station emits EM waves uniformly in all
directions.
Part A
How much energy per second crosses a 1.4 m2 area 1 km from the
transmitting antenna?
Express your answer to two significant figures and include the
appropriate units.
Part B
What is the rms magnitude of the
E⃗ field at this point, assuming
the station is operating at full power?
Express your answer to two significant figures and include the
appropriate units.
Part C
What is...

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