Download Physics 224 - Summer 2007 Test 3 (Chapters 32-33) - Magnetic Forces and Electrostatics and more Exams Physics in PDF only on Docsity!
Page 2 Test #3 (chapters 32,33) PHYS- 224 Dr. Russell (Summer 2007)
- (6 pts) A proton is moving with a velocity of v = 7.8x 10 6 m/s at a parallel distance of 0.02 m from a long straight wire carrying a current of 5.5A in the direction shown. What is the magnitude and direction of the magnetic force on the proton?
2. (6 pts) Two long straight wires 0.75m in length are separated by 0.8cm.
Currents are as shown in the figure. Determine the magnitude and direction of the force
F 1on.
PHYS-224 Dr. Russell (Summer 2007) Test #3 (chapters 32,33) Page 3
3. (6 pts) The figure shows two long straight current carrying wires. At which of the approximate
locations could the net magnetic field be zero? ( Explain )
- (6 pts) If you want to use Ampere’s Law to determine the magnetic field at some distance from a current distribution, you must pick a path that matches the symmetry of the problem. Explain how the two requirements for the path allow the nasty integral to be simplified as
∫^ B •^ d
s ⇒ B s
a. b.
5. (6 pts Three charged particles (same charge and
same mass) pass through a region containing a magnetic field directed into the page and an electric field directed towards the bottom of the page. Rank the charges according to their velocities from fastest to slowest. ( Explain your ranking )
PHYS-224 Dr. Russell (Summer 2007) Test #3 (chapters 32,33) Page 5
8. (6 pts) A rectangular loop is near a long straight wire carrying a current to the right as shown.
Which of the following choices would result in a clockwise induced current in the loop? a. The current in the long straight wire increases b. The current in the long straight wire decreases c. The loop moves to the left d. The loop moves to the right e. The loop moves toward the top of the page f. The loop moves toward the bottom of the page g. The loop rotates about the horizontal axis (horizontal dotted line) so that the top of the loop moves out of the page and the bottom of the loop moves into the page. h. The loop rotates about the vertical axis (vertical dotted line) so that the right side of the loop moves out of the page and the left side of the loop moves into the page.
9. (4 pts) For each figure, determine the direction of the force on the charge or on the current
carrying wire.
