PHY 114 Warm-Up (Sample)

Reading: Chapter 23

Name:

Student ID#

q1 - What are the similarities and differences between Newton's law of Gravity and Coulomb's law?

q2 - Which of the following is not true? The electric force

decreases with the inverse of the square of the distance between two charged particles.
between an electron and a proton is much stronger than the gravitational force between them.
between two protons separated by a distance d is larger than that be-tween two electrons separated by the same distance d.
may be either attractive or repulsive.

q3 - A material that permits electric charge to move through it is called a(n)

insulator.
conductor.
capacitor.
inductor.

q4 - Which statement is not true?

The electric field obeys the principle of superposition.
The tangent to an electric field line at a point gives the direction of the field at that point.
The density of electric field lines is directly proportional to the strength of the field.
Negative charges are sources of electric field lines and positive charge sinks.


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.):




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