exam1version2with solutions

# exam1version2with solutions - 1 Exam I Version 0002 Physics...

This preview shows pages 1–3. Sign up to view the full content.

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

View Full Document
Vers.0002 2 1. A small negative test charge - q is released from rest near a larger positive fixed charge + Q . Initially, as – q starts to move towards + Q , the magnitude of –q ’s acceleration A) increases with time B) decreases with time C) stays the same (but non-zero) as time passes D) stays the same, exactly zero, as time passes Answers: A). The distance between –q and +Q decreases with time, and the force and hence acceleration must increase with time. 2. An electric dipole is placed in an electric field as shown to the right. At the instant shown, what direction is the net force on the dipole? A) up B) right C) down D) left E) The force is exactly zero Answers: D). The E field is stronger on the left side of the dipole than on the right side, judging from the field line density. Therefore, the force on the negative charge of the dipole which points to the left is stronger that on the positive charge of the dipole. 3. Two large, parallel planes of charge made from non- conducting material are shown edge-on. The left plane has positive charge density σ , and the right plane has positive charge density 2 . The planes are so large that they can be considered infinite in extent. What is the magnitude of the electric field in region III, which lies to the right of both planes?
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 10/08/2008 for the course PHYS 1120 taught by Professor Rogers during the Fall '08 term at Colorado.

### Page1 / 12

exam1version2with solutions - 1 Exam I Version 0002 Physics...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online