PHY 114 Warm-Up

Reading: Chapter 31 sections 1-3

This Warmup is due Thursday 4/3 at 4 AM

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q1 - Why is the induced emf that appears in an inductor called a "counter" or "back" emf?

q2 - Discuss the similarities and differences between the energy stored in the electric field of a charged capacitor and the energy stored in the magnetic field of a current carrying wire.

q3 - Which of the following is true?

The inductance of a solenoid with 100 turns per millimeter and a cross sectional area of 1 cm2 increases as the current through it increases.
The inductance of a device depends on its geometry.
The SI unit of inductance is the Gauss.
Inductance and inductors have no practical use whatsoever.


Below is a space for your thoughts, including general comments about today's assignment (what seemed impossible, what reading didn't make sense, what we should spend class time on, what was "cool", etc.): (If you don't mind, please include your e-mail address for quick replies from Prof. Kim-Shapiro - this is optional)




Daniel Kim-Shapiro, Department of Physics, Wake Forest University, Winston-Salem, NC 27109, U.S.A.
shapiro@wfu.edu