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Physics Core/AP 1 and 2

Chapter 17: 7-11 Assignment

Course Materials are always under revision! Weblecture content may change anytime prior to two weeks before scheduled chat session for content.

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Homework

Physics 17: 7-11 Electric Capacitance

Homework

Reading Preparation

Text Reading: Giancoli, Physics - Principles with Applications, Chapter 17: Sections 17 to 11

Study Points

Key Equations

  • Charge on capacitor: Q   =   CV   where   C   = ϵ 0 A d  
  • Charge on dielectric with permittivity Kε0: C   = K ϵ 0 A d    = ϵ A d   
  • Electrical energy on capacitor: PE   =   1 2 QV   =    1 2 ( CV ) V   =    1 2 C V 2   = 1 2 Q ( Q C )   = 1 2 Q 2 C
  • Energy density PE Volume   =   1 2 ϵ 0 E 2

Web Lecture

Read the following weblecture before chat: Electric Fields and Capacitance: Storing Charge

Study Activity

Use the simulation below to construct capacitors with different battery voltages and distances.

  • How does doubling the voltage change capacitance?
  • How does changing the direction of the current (using negative voltage) change capacitance?
  • How does doubling the separation of the plate change the field between them?
  • How does doubling the area of the plate change the field? How does it change the capacitance?

Physics simulation Java Applets are the product of the PHET Interactive Simulations project at the University of Colorado, Boulder.

Chat Preparation Activities

Chapter Quiz

Lab Work

If you want lab credit for this course, you must complete at least 12 labs (honors course) or 18 labs (AP students). One or more lab exercises are posted for each chapter as part of the homework assignment. We will be reviewing lab work at regular intervals, so do not get behind!