The number density of free electrons in a metal piece is a very large of the order of `10^(+29) m^-3`. Why is there no current in the metal piece in the absence of electric field across it ?

A large number of free electrons are present in metals.Why is there no current in the absence of electric field across it ?

A large number of free electrons are present in metals. Why is there ni current in the absence of elctric field across it?

The number density of free electrons in a copper conductor estimated in Example 3.1 is 8.5 xx 10^28 m^-3 . How long does an electron take to drift from one end of a wire 3.0 m long to its other end? The area of cross-section of the wire is 2.0 xx 10^-6 m^2 and it is carrying a current of 3.0 A.

Are the paths of electrons straight lines between successive collisions (with positive ions of the metals) in the absence of electric field?

The number density of electron in copper is 8.5 xx10^(28)m^(-3) . Find the current flowing through a copper wire of length 20 cm, area of cross section 1 mm square,when connected to a battery of 3 V. Given the electron mobility = 4.5xx10^(-6)m^(2)V^(-1) s^(-1) and electron charge = 1.6 xx 10^(-19)C.

Drift velocity in a metallic conductor: At room temperature there are large number of free electrons having zero average velocity, but when electric field is applied, the free electrons start moving in a direction opposite to the direction of the applied field with a velocity called drift velocity. The magnitude of electric field set up across the ends of the conductor is given by

Drift velocity in a metallic conductor: At room temperature there are large number of free electrons having zero average velocity, but when electric field is applied, the free electrons start moving in a direction opposite to the direction of the applied field with a velocity called drift velocity. Magnitude of acceleration produced in each electron by the electric field is