If you think of movement of charges in matarial, their movement sometimes easy sometimes not.
Let’s understand the movement of charges.
In influence of the electric field, charges move in a particular direction.
In these kinds of situation, we need some measure for ease of
movement of charged particle.
Measurement of the ease with which a particular type of charged particle moves through a solid material under the influence of an electric field is called mobility.
Such particles are pulled along the electric field.
Such particles also periodically collide with atoms while being pulled.
This combination of electric field and collisions causes the particles to move with an average velocity, called the drift velocity.
Mobility is formally defined as the value of the drift velocity per unit of electric field strength.
μ=EVd​​
Thus, the faster the particle moves at a given electric field strength, the larger the mobility.
We found that mobility of charged particles also depends on many other parameters.
Let us understand other parameters.
The mobility of a particular type of particle in a given solid may vary with temperature.
Mobility also depends on the different type of solid.
Revision
Measurement of the ease with which a particular type of charged particle moves through a solid material under the influence of an electric field is called mobility.
Mobility is formally defined as the value of the drift velocity per unit of electric field strength.
faster the particle moves at a given electric field strength, the larger the mobility.
The mobility of a particular type of particle in a given solid may vary with temperature.
Mobility also depends on the different type of solid.