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A solid metallic spherical crust with an inner radius of 8 cm and an outer radius...

A solid metallic spherical crust with an inner radius of 8 cm and an outer radius of 15 cm has an electric charge of +5 microcoulombs. The solid metallic spherical crust is found within another larger solid metal crust with an inner radius of 20 cm and an outer radius of 25 cm. Both spherical rinds are concentric.

a) What is the electrical charge on the inner wall of the larger crust?

b) What is the electric field on the outer surface of the largest crust?

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