Two spheres of radii 1cm and 2cm have been charged with 1.5×10^-8 an 0.3×10^-7C of positive electricity. When they are connected by a wire, what will be the direction of flow of charge?

Charge flows from higher potential to lower so check the potential for the spheres so using kq/r you get for sphere of radii 1 cm a value of950 Volts while for other you get 1350 volts so charge flow from sphere(2) to sphere(1 radius)