ECE106 Lecture 16: ECE 106,University of Waterloo,(p16)

• School: University of Waterloo
• Department: Electrical and Computer Engineering
• Course: ECE106
• Professor: All

Document Summary

The total charge of the ring is q. Since the charge is uniformly distributed on the ring, so the charge linear density is. From coulomb"s law, the contribution form dq at is de = dq r. Because o is on the axis, the total field other than z-direction must be 0. The element field in z- direction, de z = dq r z . 4 s0 r3 dq r cos z . When z r, (3. 27) (3. 28) (3. 29) (3. 30) (3. 31) (3. 32) (3. 33) (3. 34) (3. 35) (3. 36) (3. 37) (3. 38) From a large distance the ring appears to be like a point of charge q at the origin. The radius of the disk is r. the observe point o lies on the axis of the disk. The total charge of the disk is q.