Chapter 22: Electromagnetic Waves
Physlet® Problems




1.  

The animation shows how static electric field lines from a positive point charge produce a radiation field if the charge is caused to oscillate.  Notice how the electric field lines form waves that move away from the charge.  What is the direction of the magnetic field associated with the waves to the right of the charge?

The magnetic field will point in the same direction as the electric field.
The magnetic field will point into the computer monitor.
The magnetic field will rotate up and down as the charge moves up and down.
The magnetic field will alternate pointing into and out of the computer monitor.


2.  

An oscillating point charge will produce a radiation field as shown in the above animation.  In what direction is the radiation a maximum?

The radiation is a maximum perpendicular to the direction of oscillation.
The radiation is a maximum along the direction of oscillation.
The radiation is uniform in all directions.


3.  


Three animations purport to show an E&M wave propagating in the z direction.  The electric field is displayed in green and the magnetic field is displayed in red.   Which animation correctly displays a physically acceptable configuration for these fields? The lengths of the E and B vectors are arbitrary, only direction and relative phase are important. You may click-drag in the animation to change the viewing angle.

Configuration A
Configuration B
Configuration C
None of the above.


4.  


The animation shows a broadcast radio wave.  What type of wave is this?  The electric field is displayed in green and the magnetic field is displayed in red.  Start.

Amplitude modulation, AM?
Frequency modulation, FM?

Physlets used by permission of Wolfgang Christian, Davidson College. Physlet Problems ©Prentice Hall, Inc; written by Aaron Titus (North Carolina State University) and Wolfgang Christian, Davidson College.


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