The drift velocity of electrons in a conducting wire is of the order of 1 mm/s, yet the bulb glows very quickly after the switch is put on beause

The drift velocity of electrons inside a conductor carrying current is of the order of 10^(-4)m//s , which means that the electrons flow very slowly through the conductor. Then why does it not require hours for a light bulb to turn on after pressing the switch ?

Assertion: Drift velocity of electrons developed in a current-carrying conductor is of the order of 10^(-4) m//s but current in the conductor is established almost instantly the switch is closed. Reason: Electric field in a conductor sets up with the speed of light.

Assertion : The drift velocity of electrons in a metallic wire will decrease, if the temperature of the wire is increased. Reason : On increasing temperature, conductivity of metallic wire decreases.

Assertion : The drift velocity of electrons in a metallic wire will decrease, if the temperature of the wire is increased. Reason : On increasing temperature, conductivity of metallic wire decreases.

A :The drift velocity of electrons in a conductor is very small still current in a conductor is establised almost instantaneously on closing the switch. R: Electric field in the condutor sets up with speed of light.

The drift velocity of the electrons in a copper wire of length 2 m under the application of a potential difference of 220V is 0.5ms^-1 . Their mobility ( in m^2v^-1s^-1 )

Assertion : A wire of uniform cross-section and uniform resistivity is connected across an ideal cell. Now the length or wire is doubled keeping volume of wire constant. The drift velocity of electrons after stretching the wire becomes one fourth of what it was before streching the wire. Reason: If a wire (or uniform resistivity and uniform cross-section) of length l_(0) is stretched by a factor n, then its resistance becomes n^(2) times the one before stretching the wire (the volume of wire is kept constant in stretching process.) Fruther at constant potential difference, current is inversely proportional to resistance. Drift velocity of free electron is directly proportional to current and inversely proportional to cross-sectional area of current carrying wire.