Define the term ‘mobility’ of charge carriers. Write its S.I. unit.

SI unit of Mobility

To determine drift velocity, we can apply the formula shown below:

I = nAvQ

Where, n is the number of electrons

I is the current flowing through the conductor which is measured in amperes

v is the drift velocity of the electrons

A is the area of the cross-section of the conductor which is measured in m2

Q is the charge of an electron which is measured in Coulombs

SI unit of mobility:

Since,

Mobility μ = drift velocity(vd)/ electric field(E)

SI unit of mobility = SI unit of drift velocity/ SI unit of electric field

SI unit of mobility = ms-1/ Vm-1

SI unit of mobility = m2 V-1 s-1

Summary:

Define the term ‘mobility’ of charge carriers. Write its S.I. unit.

The drift velocity of the charge carrier per unit of the electric field is the mobility. m2 V-1 s-1 is the SI unit of mobility. The drift velocity refers to the overall speed of these electrons.