Physics Principles and Problems 2009

Section 26.2 : Electric and Magnetic Fields in Space

Self-Check Quizzes

1
How does an increase in frequency of an electromagnetic wave effect the speed at which it travels.
  Need a Hint?
A)Its speed increases.
B)Its speed decreases.
C)Its speed remains constant.
D)It depends on the wavelength.
2
In an electromagnetic wave, the combined electric and magnetic fields _____.
A)cancel each other out
B)are perpendicular to each other
C)cannot be induced
D)have opposite signs
3
In a coil-and-capacitor circuit, when the current is zero, where is the energy of the system contained?
A)in the electric field
B)in the magnetic field
C)in the coil
D)in the waves perpendicular to the magnetic field
4
Besides coils and capacitors, _____can be used to generate oscillation voltages.
A)batteries
B)pendulums
C)quartz crystals
D)antennas
5
For good reception of electromagnetic waves, the antenna should be positioned parallel to _____.
A)the coil
B)the ground
C)the wires carrying signal to the device
D)the direction of the wave's electric fields
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