Physics 272: Honors Physics II
Spring 2017

# Wednesday 8 February 2016: Topics to be covered in the lecture (HRW Chapter 22)

• electric field definition
• electric field from specified charge distribution
• force on system of charges due to specified electric field
• conductors and insulators

1. We will start out by studying the electric field produced by a fixed arrangement of charges. In this case, the electric field at a point r is defined as the Coulomb force on a test particle of q due to the fixed arrangement of charge, divided by q (so electric field has units of force/charge = N/C in SI). Since force is a vector and charge is a scalar, the electric field is a vector field and can be represented by a diagram made up of lines called field lines. Carefully read the attached excerpt from HRW Chapter 22 (attached)
Do quizlet questions 1and 2.

2. Next, we review motion of a particle experiencing a constant force. For motion on a line, these are the familiar constant acceleration equations (HRW 2.4). For motion in a plane, this is projectile motion, for which Sample Problem 4.04 in HRW Chapter 4 should be reviewed. This will help us in understanding the motion of a charged particle in a uniform electric field (the electric field and therefore the electric force felt by the particle is the same at all points in space).
Do quizlet questions 3 and 4.

SHOULD PREVIEW THE QUIZ QUESTIONS HERE TO BE READY TO ENTER THEM WHEN YOU START THE QUIZ IN QUIZSTAR.

Note on the quizlets: When you submit the quiz, you get a message stating how many of the questions you got right or wrong. After the first attempt, you can click "Review this Quiz" to see which questions you got wrong. After the second attempt, "Review this Quiz" will also show an arrow pointing to the right answer.