A small sphere is charged to a potential of 50 V and a big hollow sphere is charged to a potential of 100 V. Electricity will flow from the smaller sphere to the bigger one when

A large hollow metallic sphere A is charged positively to a potential of 100 volt and a small sphereB to a potential of50 volt. Now B is placed inside A and they are connected by a wire. In which direction will the charge flow ?

A hollow metallic sphere of radius 0.1 m is charged to a potential of 5 V. The potential at its centre is