List of top Physics Questions on Drift Velocity

Establish the relation between drift velocity of electrons (\(v_d\)) and electric current (\(I\)) in a conductor.

How is \(v_d\) affected when the length of the conductor is doubled, keeping the voltage applied across the conductor constant?

An electric field \(E\) is established across the ends of a cylindrical conductor of length \(L\) and area of cross-section \(A\). Discuss how electrons attain an average velocity, independent of time. Hence, obtain a relation between current in the conductor and this ‘average velocity’ of electrons.

This ‘average velocity’ is found to be only a few mm/s for currents in the range of a few amperes. How then is current established almost the instant a circuit is closed?

Two copper wires having their radii in the ratio of \(3:2\) are connected in series across a battery. Find the ratio of the drift velocities of the electrons in the wires.

What is the order of magnitude of drift velocity of electrons in a conductor ? Deduce the relation between the current flowing through a conductor and drift velocity of electrons in it.

An electric field \(E\) is established across the ends of a cylindrical conductor of length \(L\) and area of cross-section \(A\). Discuss how electrons attain an average velocity, independent of time. Hence, obtain a relation between current in the conductor and this ‘average velocity’ of electrons.

This ‘average velocity’ is found to be only a few mm/s for currents in the range of a few amperes. How then is current established almost the instant a circuit is closed?

Two copper wires having their radii in the ratio of \(3:2\) are connected in series across a battery. Find the ratio of the drift velocities of the electrons in the wires.

What is the order of magnitude of drift velocity of electrons in a conductor ? Deduce the relation between the current flowing through a conductor and drift velocity of electrons in it.

A uniform wire of area of cross section $1 \times 10^{-7} m^2$ carries a current of $1.6 \text{ A}$. If the number density of electrons is $5 \times 10^{28} m^{-3}$, the drift velocity of electrons (in $\text{mm s}^{-1}$) is

A conductor of length l and area of cross-section A is connected across an ideal battery of emf V . Derive the formula for the current density in terms of relaxation time τ

When electrons drift in a conductor from lower to higher potential, does it mean that all the ‘free electrons’ of the conductor are moving in the same direction?

An electron takes \(40\times10^3\;s\) to drift from one end of a metal wire of length \(2\;m\) to its other end. The area of cross-section of the wire is \(4\;mm^2\) and it is carrying a current of \(1.6\;A\). The number density of free electrons in the metal wire is

A charged particle having drift velocity of \(7.5×10^{−4} m s^{−1} \) in an electric field of  has a mobility in  \(m^2 V^{−1} s^{−1}\) of :