Question

QUESTION 18

1. A magnetic field is perpendicular to the plane of a rectangular cable with dimensions 0.15 m x 0.30 m that has 120 turns. To induce an average "emf" of -1.2 V in the cable, the magnetic field is increased from 0.1 T to 1.5 T in a time interval t. Determine t

a. 0.053 s

b. 1.6 s

c. 7.6 s

d. 6.3 s

e. 0.13 s

QUESTION 19

1. When a radio telescope observes a region in the space between two stars, it detects electromagnetic radiation that has a wavelength equal to 0.21 m. Determine the frequency of this radiation.

a. 7.1 x 10 ^ 10 Hz

b. 6.9 x 10 ^ 11 Hz

c. 2.1 x 10 ^ 14 Hz

d. 1.4 x 10 ^ 9 Hz

e. 3.0 x 10 ^ 8 Hz

QUESTION 20

1. A radio station transmits radio waves that radiate uniformly in all directions with power 1.50 x 10 ^ 5 W. Determine the intensity of the waves when received at an antenna located 40.0 km from the transmitting antenna.

a 5.60 x 10 ^ -10 W / m ^ 2

b. 2.98 x 10 ^ -5 W / m ^ 2

c. 9.25 x 10 ^ -7 W / m ^ 2

d. 7.46 x 10 ^ -6 W / m ^ 2

e. 1.17 x 10 ^ -8 W / m ^ 2

Answer #1

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The various colors of visible light differ in:
a. its speed in a vacuum
b. frequency and its speed in a vacuum
c. wavelength only
d. frequency and wavelength
e. only in frequency
===================================================================
A radio station transmits radio waves that radiate uniformly in
all directions with power 1.50 x 10 ^ 5 W. Determine the intensity
of the waves when they are received by an antenna located 40.0 km
from the transmitting antenna.
a. 1.17 x 10 ^...

A satellite orbits Earth with an orbit radius equal to 4 × 107 m (measured
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in all directions. The intensity of the EM wave received by an antenna
circular on the Earth's surface is 2 × 10-12 W / m2 when the satellite is
located 3 × 107 m above the antenna. The antenna disk has...

QUESTION 5
1. A 0.45 m metal pole moves 0.11 m in a direction that is
perpendicular to a 0.80 T magnetic field in a time of 0.036 s.
Assuming the club acceleration is zero, determine the "emf" on the
club.
a. 0.27 V
b. 9.1 x 10 ^ -5 V
c. 0.076 V
d. You cannot determine without knowing the orientation of the
club relative to the magnetic field
e. 1.1 V
QUESTION 6
1. The units for "fem"...

A charged particle is in continuous circular motion in a plane
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of 8.84 x 10-26 kg on the particle, and a linear speed
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charge.

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c) A microwave beam has a cross-sectional area of 0.04
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field of the...

1) Determine the force per meter in a beam of 20,000 A
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2) Determine the magnitude of the magnetic field that produces a
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carrying a current of 30.0 A.

A time-varying magnetic field is perpendicular to the plane of a
circular loop of diameter 10 cm made with wire of diameter 3.4 mm
and resistivity 2.07 × 10-8?·m.
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B = (0.79 t) T/s
a) What is the magnitude of the emf induced in the loop?
b) What is the value of the current through the loop?
c) At what rate does energy appear as thermal energy in the...

An electromagnetic wave from a wire antenna travels
(from the reader) toward the plane of the paper. At time t = 0.0 s
it strikes the paper at normal incidence. At point O and t = 0.0 s,
the magnetic field vector has its maximum value,
3.79×10-8 T, pointing in the negative y-direction. The
frequency of this wave is 1.22×106 Hz
1. What is the x-component of the associated electric
field E at time t = 0.0 s? (Use the...

A dish antenna with a diameter of 15.0 m receives a beam of
radio radiation at normal incidence.
The radio signal is a continuous wave with an electric field
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E = 0.75 sin[(0.838/m)x − (2.51 × 108 /s)t] N/C.
Here, x is in meters and t is in seconds. Assume that all the
radiation that falls on the dish is absorbed.
(a) Calculate the speed of the radiation. Don’t assume it must
be equal to c: use the...

1) Determine the magnitude of the magnetic field that causes a
circular path with a radius of 0.800 m in a proton with a speed
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2) Determine the induced Hall voltage at the heart of a person
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s and perpendicular to a magnetic field of 1.50 T.

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