Define the term mobility of charge carriers in a current carrying conductor. Obtain the relation for mobility in terms of relaxation time.

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

The dimensions of mobility of charge carriers are

Define the term 'drift velocity' of electrons in a current carrying conductor. Obtain the relationship between the current density and the drift velocity of electrons.

Define the term "current".

Define the term 'wattles current'.

(i) Define ampere in terms of force between two current carrying conductors. (ii) What is an ideal transformer ?

Define the term potential energy of charge q at a distance r in an external electric field.

Mobility of free electrons in a current carrying conductor is proportional to (1) Relaxation time (2) Electric field (3) Potential difference (4) All of these

Explain the term 'drift velocity' of electrons in a conductor. Hence obtain the expression for the current through a conductor in terms of 'drift velocity'.

Write the mathematical relation between mobility and drift velocity of charge carriers in a coductor. Name the mobile charge carriers responsible for conduction of electric current in (a) an electrolyte (b) an ionised gas.