Question: 3. A circular disk of radius a in the cy-plane has a surface charge density of the form 000 cos . If the z-axis

3. A circular disk of radius a in the cy-plane has a

3. A circular disk of radius a in the cy-plane has a surface charge density of the form 000 cos . If the z-axis passes through its center, use cylindrical coordinates to find the electric field E at the point = k above the disk (12pts).

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