1. Find the electric field (in vacuum) as a function of position z along the axis...

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1. Find the electric field (in vacuum) as a function of position z along the axis of a uniformly charged disk of outer radius R with a hole of radius Ri in its centre. The charge per unit area on the disk is σ. 2. A straight rod, with uniform charge λ per unit length, lies along the z axis from z=11 to z=12. (Thus, the length of the rod is 12-11.) Find the x and y components of the electric field (in vacuum) at a distance x along the x axis.

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