List of top Physics Questions on Drift Velocity

The torque required to increase the angular speed of a uniform solid disc of mass 10 kg and diameter 0.5 m from zero to 120 rotations per minute in 5 sec is:
The value of escape velocity \( v_e \) for a planet depends on:
The slope of the graph plotted between the square of the time period of a planet \( T^2 \) and the cube of its mean distance from the sun \( r^3 \) is:
A fluid has stream line flow through a horizontal pipe of variable cross-sectional area. Then:
A stationary body of mass 5 g carries a charge of 5 $\mu$C. The potential difference with which it should be accelerated to acquire a speed of 10 m/s is:
A steady current of 2 A is flowing through a conducting wire. The number of electrons flowing per second in it is:
The terminal potential difference of a cell in the open circuit is 2 V. When the cell is connected to a 10$\omega$ resistor, the terminal potential difference falls to 1.5 V. The internal resistance of the cell is:
In an LCR circuit, at resonance, the value of the power factor is:
A proton and a photon have the same energy. Then the de-Broglie wavelength of proton \( \lambda_p \) and wavelength of photon \( \lambda_0 \) are related by:
Bohr atom model is invalid for:
The energy equivalent of 1 g of a substance in joules is:
Four hydrogen atoms combine to form an \( ^4_2He \) atom with a release of 26.7 MeV of energy. This is:

In the circuit given below, the current is: 

Electric conduction in a semiconductor is due to:
The drift velocity of electrons in a conducting wire connected to a cell is \( V_d \). If the length of the wire is doubled and area of cross-section is halved, then the drift velocity of electrons becomes:
For a given electric current the drift velocity of conduction electrons in a copper wire is vd and their mobility is μ . When the current is increased at constant temperature
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 copper wire of length 1 m and uniform cross sectional area 5 × 10-7 m2 carries a current of 1 A. Assuming that there are 8 × 1028 free electrons per m3 in copper, how long will an electron take to drift from one end of the wire to the other?
The magnitude of tfie drift velocity per unit electric field is defined as
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 :
Two metallic wires 'A' and 'B' are having same cross-sectional areas and same current passes through them. Find ratio of drift velocity of electrons in wire 'A' and 'B'.
[electron density of wire A = 8.0×1028m-3 and electron density of wire B = 9.0×1028m-3]
A copper wire of 3 mm2 cross sectional area carries a current of 5 ampere. The magnitude of the drift velocity for the electrons in the wire, (Assume copper to be monovalent, Mcu 63.5 kg/k mol and density of copper = 8920 kg/m3)
The effect of temperature of the conductor on the drift velocity of electrons.