The space among the two concentric conducting spherical shells of radii b = 2.40 cm and a = 1.20 cm is filled with a substance of dielectric constant of13.1. The potential difference V = 89.0 V is applied across the inner and outer shells. Find out (i) the capacitance of the device, (ii) the free charge q (in C) on the inner shell and (iii) the charge q (in C) induced all along the surface of the inner shell.