1. EEE340 Lecture 111 Example 3-9 Obtain a formula for the electric field on the axis of a circular disk of radius b that carries a uniform surface charge density Solution. and

2. EEE340 Lecture 112 Therefore, For very large z,

3. EEE340 Lecture 113 Example 3-10 Obtain a formula for the electric field intensity along the axis of a uniform line charge the length L. The uniform line-charge density is Solution.The distance

4. EEE340 Lecture 114 If any other point is chosen as reference, then where C is a constant that can be chosen to make the potential vanish wherever we like. Example: If V = 0 at ( 0,0,0 ), find V at A ( 5,0,1 ). A point charge 5nC is located at (-3,4,0 ), line y = 1, z = 1 carries uniform charge 2 nC/m

5. EEE340 Lecture 115 The potential at any point is Hence,  is the perpendicular distance from the line to the field point. r is the distance from the point charge to the field point.

6. EEE340 Lecture 116