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A point charge of -3.00 μC is located in the center of a spherical cavity of...

A point charge of -3.00 μC is located in the center of a spherical cavity of radius 6.70 cm inside an insulating spherical charged solid. The charge density in the solid is 7.35 × 10−4 C/m3.

part A

Calculate the magnitude of the electric field inside the solid at a distance of 9.10 cm from the center of the cavity.

Express your answer with the appropriate units.

part B

Find the direction of this electric field.

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