Exercises/Activities Test Yourself: Encircle the letter of the correct answer. 1. Which of Maxwell's Equations allows you to figure out an equation for the electric field created by a distribution of charge? a. Gauss' Law b. Faraday's Law c. Gauss' Law for Magnetism d. Ampere's Law 2. Which of Maxwell's Equations describes the field created by an electric current? a. Gauss' Law b. Faraday's Law c. Gauss' Law for Magnetism d. Ampere's Law 3. What are Maxwell's Equations? a. A series of four partial differential equations that describe the force of electromagnetism. b. A series of four partial differential equations that describe the force of gravity. c. A series of four partial differential equations that describe the nuclear force. d. A series of four partial differential equations that describe everything in the universe. 4. What do bands of the electromagnetic spectrum have in common? a. They all have the same wavelength c. They all travel at the same speed b. They all have the same frequency d. nothing in common 5. Which statements accurately describes a step/s in the generation or EM waves? a. A moving charge creates a constant current, which then creates a magnetic field b. A changing current creates a changing magnetic field which induces electric field C. A changing magnetic field creates an induced current which creates an opposing magnetic field 6. The E and B fields in electromagnetic waves are oriented a. parallel to the wave's direction of travel, as well as to each other. b. parallel to the wave's direction of travel, and perpendicular to each other. c. perpendicular to the wave's direction of travel, and parallel to each other. d. perpendicular to the wave's direction of travel, and also to each other. 7. Electromagnetic waves are classified using what measurement? a. Frequency b. amplitude c. power d. energy 8. Electromagnetic waves are a. longitudinal b. transverse. c. both longitudinal and transverse. 9. What frequency are 20 mm microwaves? a. 100 MHz b. 400 MHz c. 15 GHz d. 73 GHz 10. What is the wavelength of a 92.9 MHz radio wave? 6 a. 32 mm b. 32 cm c. 3.2 m d. 32 m