PHYS-224 Dr. Russell (Summer 2008) Test #3 (chapters 33, 34) Page 1
Name: (please print) _______________________________________
Class Meeting Time: 8:00am 11:25am 2:25pm
1. You must show ALL work in a clear and organized manner in order to receive full credit. Insufficient
work or incomplete explanations will result in a loss of points.
2. Cheating will be dealt with severely. Keep your eyes on your own paper, and do not attempt to talk or
communicate to any student around you. Students who are involved in any kind of cheating will
receive a ZERO on this test, and will be referred to the Dean of Students for disciplinary action.
3. Except for a simple numerical mistake in adding points, any appeals regarding how this exam was
graded must be submitted in writing (return the exam also) within 3 class meetings after the test was
handed back.
Test #3 Raw Score: ____ / 60 Test #3 Grade: _____ / 100
1. (10 pts) A circular loop of radius 0.02m carries a counter-clockwise current of 0.2A. A long straight
wire carrying a current of 0.5A (toward the top of the page) is located 0.04m to the left of the center of
the circular loop. A
€
6.5 ×10−9C
point charge is moving with a velocity of
€
3.5 ×106m / s
toward the top
of the page and is 0.04m to the right of the center of the loop. What is the magnitude and direction of
the magnetic field at the center of the loop?
