I want to build a spherical  capacitor out of two neutral spherical conductors. A smaller sphere with radius a and a larger sphere with radius 2a are assembled. A charge +Q>0 is moved from the outer conductor to the inner conductor. a) Find the electric field (direction and magnitude) in the following regions, where r is the radial distance measured from the center of the two conductors. Region I: r<a, Region II: a<r<2a, Region III: 2a<r. b)Find the potential difference between the two spheres.i.e. the potential at the outer sphere minus the potential at the inner sphere. c) Determine the capacitance of the assembly.

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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.