Question

the speed of electron is not very high then how the bulb is on immediately when do the switch and bulb are far away from each other in a household circuit

Answer 1

When we close the circuit, the electric field is set up in the entire closed circuit instantly
Due to it, the current is set up in the entire circuit instantly. The current so set up does not wait for the electrons to flow from one end of the conductor to other end

Here the electrons adjacent to the bulb move and reach the bulb within no time.

It is due to this reason, the electric bulb glows immediately when switched on.

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