Question

When a battery is connected to a closed circuit , charge flow in the circuit almost instanteously . Explain

Answer 1

When electric current in a material is proportional to the voltage across it, the material is said to be "ohmic", or to obey Ohm's law. A microscopic view suggests that this proportionality comes from the fact that an applied electric field superimposes a small drift velocity on the free electrons in a metal. For ordinary currents, this drift velocity is on the order of millimeters per second in contrast to the speeds of the electrons themselves which are on the order of a million meters per second.
However applying a voltage is like a push on a set of hard spheres lined up along the length of the wire. The push is tarnsmitted very fast to the end of the line