https://chip.physics.purdue.edu/protected/IEcalculusEMimg/uiuc112-02-IE_spheres.

Question

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Spherical Shell Insulator

An insulator in the shape of a spherical shell is shown in cross-section above (the link). The insulator is defined by an inner radius a = 4 cm and an outer radius b = 6 cm and carries a total charge of Q = + 9 mu or micro C (1 mu or micro C = 10-6 C). (You may assume that the charge is distributed uniformly throughout the volume of the insulator).
What is Ey, the y-component of the electric field at point P which is located at (x,y) = (0, -5 cm) as shown in the diagram?

Explanation / Answer

This link might prove helpful. Rate if it does :) http://wug.physics.uiuc.edu/cgi/courses/shell/per/phys112/ie.pl?02/IE_spheres

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