A uniformly charged spherical shell with positive surface charge density Contains a circular hole in its surface. The radius r of the hole is small compared with the radius R of the sphere. What is the electric field at the centre of the hole?
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A point charge q is located at the centre of a spherical shell of radius a that has a charge -q uniformly distributed on its surface. Find the electric field for all points outside the spherical shell.
An uncharged nonconducting hollow sphere of radius 10.0 cm surrounds a 10.0-μC charge located at the origin of a cartesian coordinate system. A drill with a radius of 1.00 mm is aligned along the z-axis, and a hole is drilled in the sphere. Calculate the electric flux through the hole.
