Physics 51 Sample Midterm 1

Physics 51 Sample Midterm 1 - Physics 51 Sample Midterm...

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

View Full Document Right Arrow Icon

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

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Physics 51 Sample Midterm Exam #1 (23 points) by Todd Sauke Question #1. A point charge Q = -800 nC (nano- Coulombs) and two unknown point charges, q 1 and q 2 , are placed as shown in the figure at right. The electric field at the origin O, due to charges Q, q 1 and q 2 , is equal to zero. We want to determine the values of charges q 1 and q 2 . The electric field vector at the origin has two components (x and y). Because the electric field at the origin is zero, both the x and y components are zero. We can consider the x and y components separately. Remember that the y component of the electric field at the origin due to q 1 is zero, since it is on the x axis. What is the y component of the E field at the origin due to the charge Q? (Use a trigonometric function to obtain the y component.) _______________________________ N/C 1 point (check the sign!) What must be the y component of the E field at the origin due to q 2 (in order to cancel out the E field from Q)? ________________________________N/C 1 point What must the charge q 2 be to provide this field? _________________________________nC 1 point (note units!) Working similarly, what must the charge q 1 be in order for the E field at the origin to be zero?...
View Full Document

This note was uploaded on 09/08/2010 for the course PHYS 51 at San Jose State University .

Page1 / 4

Physics 51 Sample Midterm 1 - Physics 51 Sample Midterm...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online