1 / 21

ELECTRIC FIELD AND MAYBE CHARGE

ELECTRIC FIELD AND MAYBE CHARGE. W2-D1. Answer to a Question. “Was this a typical class”? (Friday) My answers: No – it was a bit screwed up. Usually there would be some hands on experiments but for this topic (E-Field) there really aren’t any. There is for the next topic

woody
Télécharger la présentation

ELECTRIC FIELD AND MAYBE CHARGE

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ELECTRIC FIELD AND MAYBE CHARGE W2-D1

  2. Answer to a Question • “Was this a typical class”? (Friday) • My answers: • No – it was a bit screwed up. • Usually there would be some hands on experiments but for this topic (E-Field) there really aren’t any. • There is for the next topic • Sometimes it will be solving problems in a team atmosphere. • Sometimes, like next Monday, we don’t do anything at all! (Labor Day)

  3. This Week • Today • Complete E field and discuss (briefly) the dipole. • More talking than usual. • Clicker time (easy) • Wednesday • We will begin a serous discussion of charge and how it moves around. • Friday • Quiz on the past two weeks of work through the end of Wednesday’s class • Next Monday • Labor Day – no classes

  4. Let’s try those new fangled clicker-2thingys … • I will quickly review numeric entry • We will see if the system works properly • Clicker Points • Correct Answer= 2 points • Incorrect Answer = 1 point • No response = 0 points • Let’s see how it works.

  5. Answering Numeric 123 Click here Click here Click here Click here

  6. Answering Numeric 123 Click here

  7. Let’s try it..

  8. Using the A-E buttons, which statement is the most correct? • The electric field is a scalar quantity that relates the force on a charge relative to another charge. • The electric field is a computational convenience that allows us to normalize Coulomb forces. • The electric field is a real scalar property of space. • The electric Field is a figment of Dr. Bindell’s mind. • None of these are correct.

  9. At a point in space, the electric field is E. A charge is placed at the point. • If the charge at the point is doubled, the electric field is doubled as well. • If the charge at the point is doubled, the force on the charge that produced the field is doubled. • If the charge is doubled, the electric field remains the same. • None of these statements are correct.

  10. IMPORTANT IMPORTANT drawing convention: We place the tail of the electric field vector at the place where the field has that (vector) value. The electric field is everywhere, and has different (vector) values at different locations. So to be clear we always place the tail at the location corresponding to that vector.

  11. - r Note: q1q2 is (-) y + x

  12. SUPERPOSITION! x E2 r1 r1 points to the position of the charge q1 r points to the position we want to calculate E origin 

  13. For each charge in the region .. x x is the vector from the charge to the point of interest. r r1 1 1 E(r) Thus 

  14. Electric Field Mapping

  15. Which Charge Is Bigger?   A B A A is bigger B B is bigger C Both the same D You can’t tell from this diagram

  16. Activity • TWO CHARGE THUNKER • two equal and opposite charges • a few antennas • A few volunteers. • The E-Field Worksheet • A – Prediction • B - Verification via • http://physics.weber.edu/schroeder/software/EField/

  17. Next Time • We complete the dipole discussion. • We start some interesting but simple experiments.

More Related