A solid conducting sphere of 15 cm radius is located at the center of a spherical conducting shell, whose inner radius is 21 cm and outer radius 42 cm. At a distance of 50 cm from the center of these concentric conductors, the electric field is 2.1 x 105 V/m and is pointing outward. The shell has a net charge of +3.1 µC. What is the net charge on the sphere at the center in µC?
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