Go
to: Course
homepage,
Lectures
Lecture 9: iq07
1. Uniformly
charged ring: Ering(q,r;z)
2. Setup
the integral expression:
o
Geometry: Disk(Q,R)=S i flat-ring(DQi,
r), r: from 0 to R in Dr interval.
o
Edisk(Q,
R; z)=
S
i [DEFR(DQi,
r; z)], DQ=(DQ/DA)DA=(Q/A)
2prDr.
3. Verify
the textbook integral expression p641.
4. Integration:
Find F(r), where f(r)=dF(r)/dr.
o
f(r): integrand function and F(r): integral
function
o
Integration leads to final expression for: EDisk(Q,
R; z).
o
Small and large z limits of the field.
Announcements:
1.
Reading: Remainder of the chapter16, part of chapter 22 on Guass
law.
2.
See earlier announcement:
o
Facebook
o
Clicker
related issues.
o
How
to contact your instructor?