The space between two concentric conducting spherical shells of radii b=1.70 cm and a=1.20 cm is filled with a substance of dielectric constant k=6.91 A. A potential difference V=73.0 V is applied across the inner and outer shells Determine (a) the capacitance of the device (b) the free charge q on the inner shell, and (c) the charge q induced along the surface of the inner shell?

Explanation

`a) 31.4 pF b) 2.29 nC c)1.96 nC`