Two metallic spheres of radii 1 cm and 3 cm are given charges of −1×10−2 C and 5×10−2 C, respectively. If these are connected by a conducting wire, the final charge on the bigger sphere is: (2012 Mains)
a. 2×10−2 C
b. 3×10−2 C
c. 4×10−2 C
d. 1×10−2 C