MEDIUM
12th CBSE
IMPORTANT
Earn 100
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.
Important Questions on Current Electricity
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.
EASY
12th CBSE
IMPORTANT
Define resistivity of a conductor. Plot a graph showing the variation of resistivity with temperature for a metallic conductor. How does one explain such a behaviour, using the mathematical expression of the resistivity of a material.
EASY
12th CBSE
IMPORTANT
Draw a plot showing the variation of resistivity of a conductor with the increase in temperature.
How does one explain this behaviour in terms of number density of charge carriers and the relaxation time?
EASY
12th CBSE
IMPORTANT
Draw a plot showing the variation of resistivity of a semiconductor, with the increase in temperature.
How does one explain this behaviour in terms of number density of charge carriers and the relaxation time?
EASY
12th CBSE
IMPORTANT
Define conductivity of a conductor and state its SI unit. State and explain the variation of conductivity of good conductor with temperature.
EASY
12th CBSE
IMPORTANT
Define conductivity of a conductor and state its SI unit. State and explain the variation of conductivity of ionic conductor with temperature.
EASY
12th CBSE
IMPORTANT
Establish the relation between drift velocity of electrons and the electric field applied to the conductor.
Or
Derive an expression for drift velocity of free electrons in a conductor in terms of relaxation time.
EASY
12th CBSE
IMPORTANT
Establish a relation between current and drift velocity.
