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1. A solid conducting sphere of radius a and total charge + 4Q is located inside a concentric conducting spherical shell of inner radius b, outer radius c and total charge - 2Q as shown in the figure below. ☺ Αγώγιμη σφαίρα Αγώγιμο σφαιρικό κέλυφος To be found: (a) the electric field strength at a distance r from their common centre for the cases: 1) ka, ii) a<r<b, 111) b<r<c and iv)c<r (b) the surface charge densities on the inner and outer surfaces of the conducting shell c) If a=2 cm, b=4 cm, c=5 cm, and Q=2uc find the measure of the electric force exerted on a charge q=5°C placed at a distance r=3 cm from the centre of the conductive sphere τρας. Δίνεται k = 1 =9. 109 Nm2/C2 4πέρ