MEDIUM
12th CBSE
IMPORTANT
Earn 100

Prove that the current density of a metallic conductor is directly proportional to the drift speed of electrons.

Important Questions on Current Electricity

MEDIUM
12th CBSE
IMPORTANT
What is meant by drift velocity of free electrons ? Derive Ohm's law on the basis of the theory of electron drift.
EASY
12th CBSE
IMPORTANT
Are the paths of electrons straight lines between successive collisions (with positive ions of the metal) in the absence of electric field
MEDIUM
12th CBSE
IMPORTANT
Are the paths of electrons straight lines between successive collisions (with positive ions of the metal) in the presence of electric field ? Establish a relation between drift velocity 'vd' of an electron in a conductor of cross-section 'A', carrying current 'I' and concentration 'n' of free electrons per unit volume of conductor. Hence obtain the relation between current density and drift velocity.
EASY
12th CBSE
IMPORTANT
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.
EASY
12th CBSE
IMPORTANT
A conductor of length 'l' is connected to a d.c. source of potential 'V'. If the length of the conductor is tripled, by stretching it, keeping 'V' constant, explain how do the following factors vary in the conductor : Drift speed of electrons
EASY
12th CBSE
IMPORTANT
A conductor of length 'l' is connected to a d.c. source of potential 'V'. If the length of the conductor is tripled, by stretching it, keeping 'V' constant, explain how do the following factors vary in the conductor :Resistance
EASY
12th CBSE
IMPORTANT
A conductor of length 'l' is connected to a d.c. source of potential 'V'. If the length of the conductor is tripled, by stretching it, keeping 'V' 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