Mag. Field - PHY 2049C General Physics B Fields, Circuits,...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
PHY 2049C – General Physics B Fields, Circuits, Waves, Light Today: 1) RC-circuits 2) Magnetic Fields
Background image of page 1

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

View Full DocumentRight Arrow Icon
RC-Circuits: Discharging a Capacitor A capacitor is charged with charge Q 0 , V = Q 0 /C Switch is closed, current can flow. Kirchhoff's loop: // 00 , 0 0 () , () tRC Qd Q IR I Cd t Q R t dQ Q dt RC Qt Qe It Ie −− −= += ==
Background image of page 2
RC-Circuits: Charging a Capacitor Kirchhoff's loop rule: // 0 / /0 differentiate w.r.t. : 1 0 so ( ) (1 ) tRC CR IR Q C t dI dQ R dt C dt I It Ie e RC R VV e −− = = =− = = = E E EE
Background image of page 3

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

View Full DocumentRight Arrow Icon
RC-circuits Demo: Charge and Discharge The value of τ =RC determines a response time for the RC-combination. If we switch much faster than τ =RC, the system can not follow. We call this behavior “Low pass filter”. τ =RC τ =RC
Background image of page 4
And now for something completely different
Background image of page 5

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

View Full DocumentRight Arrow Icon
Intro: Magnetic Fields Magnetic Fields are produced by moving charges ( Electric Fields are produced by charges ) ± Moving single charge ± Current in a wire ± “Permanent” Magnet: Electrons in the material move in a coordinated manner.
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 19

Mag. Field - PHY 2049C General Physics B Fields, Circuits,...

This preview shows document pages 1 - 7. Sign up to view the full document.

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