Two point charges are enclosed by a spherical conducting shell that has an inner and outer radius of 13.0cm and 15.2cm, Retrospectively. One point charge has a charge of 1=9.50, while the second point charge has an unknown charge 2. The conducting shell is known to have a net electric charge of -4.10, but measurements find that the charge on the outer surface of the shell is 3.70.
Determine the charge 2 of the second point charge in units of microcoulombs.