A spherical metallic shell with an internal radius of 20 cm and an external radius of 30 cm is charged with + 3.5 μC. At its center, a point charge q = + 2.5 μC is located. Calculate: (a) the electric field module at a distance of 10 cm from the center of the shell. (b) the module of the electric field at a distance of 25 cm from the center of the shell. (c) the module of the electric field at a distance of 50 cm from the center of the shell. (d) the value of the electric charge that is distributed on the internal and external surfaces of the spherical shell.
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