PHYA22H3 Chapter 31: PHYA22 Chapter 31.doc

• School: UTSC
• Department: Physics and Astrophysics
• Course: PHYA22H3
• Professor: Brian Wilson

Document Summary

Increasing the drift speed will increase the number of electrons passing through a wire each second: electric current in the wire: ie = neavd. The sea of electrons will quickly slow down and stop unless you continue pushing it with an electric field: an electron current is a nonequilibrium motion of charges sustained by an internal electric field so (e . 0): an electric field creates a current. The nonuniform surface charge density creates an electric field inside the wire; it is positive at the positive capacitor plate, zero at the midpoint and negative at the negative plate. The on-axis field of a ring of charge: points away from a positive ring and toward a negative ring o, decreases with distance away from the ring. The electron speeds up, with increasing kinetic energy, until its next collision with an ion and it transfers energy, the friction that raises the temperature of the wire.