EASY
12th CBSE
IMPORTANT
Earn 100
Define relaxation time of electrons in a conductor. Explain how it varies with increase in temperature of a conductor. State the relation between resistivity and relaxation time.
Important Questions on Current Electricity
EASY
12th CBSE
IMPORTANT
A conductor of length is connected to a d.c. source of potential If the length of the conductor is tripled, by stretching it, keeping constant, explain how do the following factors vary in the conductor : Drift speed of electrons
EASY
12th CBSE
IMPORTANT
A conductor of length is connected to a d.c. source of potential If the length of the conductor is tripled, by stretching it, keeping constant, explain how do the following factors vary in the conductor :Resistance
EASY
12th CBSE
IMPORTANT
A conductor of length is connected to a d.c. source of potential If the length of the conductor is tripled, by stretching it, keeping constant, explain how do the following factors vary in the conductor : Resistivity.
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 electrolyte
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.
