15. The cross section of two concentric spheres is shown in the figure, with radius of the inner solid sphere as 15.0 cm, and the outer shell having inner and outer radii as 20.0 cm and 25.0 cm respectively. The charge of the whole inner sphere is -25.0 nC and is spread uniformly throughout, and the charge on the whole outer shell is +35.0 nC. The outer shell is a conductor. a. What is the charge density in the inner sphere? b. Use Gauss's Law to find the magnitude and direction of the electric field at a distance of 12.0 cm c. Use Gauss's law to find the magnitude and direction of the electric field at a distance of, r = 17.0 cm.

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.