QuizWk4Soln - Name Section Physics 208 Spring 08 Week 4 Quiz Feb 14 2008 1 Two uniformly-charge spheres are firmly fastened to and electrically

# QuizWk4Soln - Name Section Physics 208 Spring 08 Week 4...

This preview shows page 1 - 2 out of 2 pages.

Name ____________________________________ Section ___________ Physics 208, Spring 08, Week 4 Quiz Feb. 14, 2008 1. Two uniformly-charge spheres are firmly fastened to, and electrically insulated from, frictionless pucks on an air table. The charge on sphere 2 is three times the charge on sphere 1. Which choice below correctly shows the magnitude and direction of the forces? 3. A material that permits electric charge to move through it is called a(n) a. insulator b. conductor c. inductor d. perceptor 3. Below are three particles, two +1 µ C and one -1 µ C, all 1 mm from the origin. Mark with an X a location that a particle with adjustable positive charge could be placed so that the electric field at the origin could be made zero. The electric field at the origin due to the two positive charges is zero. The electric field at the origin due to the negative charge is directed upwards. So any position along the positive y-axis would let a positive charge cancel this electric field. x y + + Forces are equal and opposite (Newton’s 3 rd law). Or, force on Q 2 from Q 2 is F = 1 4 "# o Q 1

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern