physics HW #2

# physics HW #2 - Physics 112 HW#2 April 9 2010 1 Two charges...

This preview shows pages 1–2. Sign up to view the full content.

Physics 112 HW #2 April 9, 2010 1. Two charges are placed on the x axis. One of the charges ( q 1 = +8.0 µC) is at x 1 = +3.1 cm and the other ( q 2 = -23 µC) is at x 2 = +9.1 cm. (a) Find the net electric field (magnitude and direction) at x = 0 cm. (Use the sign of your answer to indicate the direction along the x -axis.) N/C (b) Find the net electric field (magnitude and direction) at x = +6.3 cm. (Use the sign of your answer to indicate the direction along the x -axis.) N/C 2. A small drop of water is suspended motionless in air by a uniform electric field that is directed upward and has a magnitude of 7760 N/C. The mass of the water drop is 3.45 10 -9 kg. (a) Is the excess charge on the water drop positive or negative? positive negative Why? (b) How many excess electrons or protons reside on the drop? 3. The magnitude of each of the charges in the figure below is 9.10 10 -12 C. The lengths of the sides of the rectangles are 2.88 cm and 4.60 cm. Find the magnitude of the electric field at the center of the rectangle in the figures below.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### 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