An Equation for Current

What is relaxation time of electron?

What happens to free electron in conductor when electric field is applied across the conductor?

Derive the expression for drift velocity of free electrons and list the factors affect it.

Why the average velocity of electrons in a conductor is zero, when no electric field is applied across the conductor.?

What is meant by conductors?

Define the term is an insulator.

How the materials are classified on their electrical properties?

Which of a given element has higher charge density?

What is charge carrier density?

The current in a copper wire is increased by increasing the potential difference between its ends. Which one of the following statements regarding the number of charge carriers per unit volume in the wire and ${\mathrm{v}}_{\mathrm{i}}$, the drift velocity of the charge carriers is correct?

The figure given below shows a network of eight resistors, each equal to $2 \mathrm{\Omega },$ connected to a $3 \mathrm{V}$ battery of negligible internal resistance. The current $I$ in the circuit is 

A metal wire is subjected to a constant potential difference. When the temperature of the metal wire increases, the drift velocity of the electron in it 

A conductor wire having ${10}^{29}$ free electrons/$m^3$ carries a current of $20A.$ If the cross-section of the wire is $1 m{m}^2,$ then the drift velocity of electrons will be 

Insulators cannot be charged by _____ (conduction/induction).