EASY
12th CBSE
IMPORTANT
Earn 100
Write the mathematical relation between mobility and drift velocity of charge carriers in a conductor. Name the mobile charge carriers responsible for conduction of electric current in
an electrolyte
Important Questions on Current Electricity
EASY
12th CBSE
IMPORTANT
Write the mathematical relation between mobility and drift velocity of charge carriers in a conductor. Name the mobile charge carriers responsible for conduction of electric current in
an ionised gas.
EASY
12th CBSE
IMPORTANT
Define the term 'conductivity' of a metallic wire. Write its SI unit.
MEDIUM
12th CBSE
IMPORTANT
Using the concept of free electrons in a conductor, derive the expression for the conductivity of a wire in terms of number density and relaxation time. Hence obtain the relation between current density and the applied electric field
EASY
12th CBSE
IMPORTANT
Define ionic mobility. Write its relationship with relaxation time. Give its SI unit. How does one understand the temperature dependence of resistivity of a semiconductor.
EASY
12th CBSE
IMPORTANT
Define the terms (i) drift velocity, A conductor of length is connected to a source of emf If this conductor is replaced by another conductor of same material and same area of cross-section but of length how will the drift velocity change ?
EASY
12th CBSE
IMPORTANT
Define the terms (ii) relaxation time. A conductor of length is connected to a source of emf If this conductor is replaced by another conductor of same material and same area of cross-section but of length how will the drift velocity change ?
MEDIUM
12th CBSE
IMPORTANT
Define relaxation time of the free electrons drifting in a conductor. How is it related to the drift velocity of free electrons ? Use this relation to deduce the expression for the electrical resistivity of the material.
MEDIUM
12th CBSE
IMPORTANT
Define the term resistivity of a conductor. Give its SI unit. Show that the resistance of a conductor is given by
where the symbols have their usual meanings.
