Physics 1215 Reading Questions
Assignment #10

Chapter 21.0 - 21.7, 21.11 - 21.12

Reading Questions should be submitted electronically using this form. They are due by 8:00 a.m. on Tuesday, April 15, 2008.
Any Reading Questions arriving late will receive no credit.
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Answer the Reading Questions below. Please answer each question.

1. Is it possible for a loop of wire to have a magnetic flux passing through it, and to not have an induced emf associated with it? Explain your answer.

2. By considering the variables in the equation for magnetic flux, list three ways that the magnetic flux can be changed.

3. What is the SI unit for magnetic flux?

4. The face of a loop of wire with area A is perpendicular to a magnetic field of constant magnitude B. If the magnetic field goes through 1/2 of the area enclosed by the wire, what is the magnetic flux through the wire?

5. A loop of wire is held steady in an uniform magnetic field. The magnitude of the uniform external magnetic field is changing. The direction of the induced magnetic field caused by the current in the wire will be

in the same direction as the external magnetic field.
in the opposite direction from the external magnetic field.
either in the same or opposite direction as the external magnetic field.

6. How is the magnetic field and the electric field in an electromagnetic wave oriented to each other and to the direction of the wave?

7. What is the SI unit of inductance?

8. What does the voltage across an inductor depend on?

9. Which of the following situations will create an emf in an inductor? (a) a dc current that has just been switched on, (b) a dc current that has been on for a long time, (c) an ac current that has just been switched on, (d) an ac current that has been on for a long time.

10. Does a step-up transformer increase electrical power? Explain

Final Question: (This question must be answered to receive any credit). What is one thing from the chapter that you didn't understand or need clarified?

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