Chapter 3 – Current Electricity

A resistance is shown in the figure. Its value and tolerance are given respectively by : A resistance is shown in the figure. Its value and tolerance are given respectively by : December 5, 2020 Category: Arihant Physics by D.C Pandey , Chapter 3 - Current Electricity , Volume 2 ,

A copper wire is stretched to make it 0.5 % longer. The percentage change in its electrical resistance if its volume remains unchanged is : A copper wire is stretched to make it 0.5 % longer. The percentage change in its electrical resistance if its volume remains unchanged is : December 5, 2020 Category: Arihant [...]

Drift speed of electrons, when 1.5 A of current flows in a copper wire of cross section 5 mm^2 , is v. If the electron density in copper is 9×10^28/m^3 the value of v in mm/s close to (Take charge of electron to be =1.6×10^−19C) Drift speed of electrons is v. If the electron density [...]

The resistive network shown below is connected to a D.C. source of 16 V. The power consumed by the network is 4 Watt. The value of R is : The resistive network shown below is connected to a D.C. source of 16 V. The power consumed by the network is 4 Watt. The value of [...]

To verify Ohm’s law, a student connects the voltmeter across the battery as shown in the figure. The measure voltage is plotted as a function of the current, and the following graph is obtained. if VO is almost zero. identify the correct statement a student connects the voltmeter across the battery as shown in the [...]

Space between two concentric conducting spheres of radii a and b(b>a) is filled with a medium of resistivity ρ. The resistance between the two spheres will be : Space between two concentric conducting spheres of radii a and b(b>a) is filled with a medium of resistivity ρ. The resistance between the two spheres will be [...]

In a meter bridge experiment, the circuit diagram and the corresponding observation table are shown in figure. Which of the readings is inconsistent? In a meter bridge experiment the circuit diagram and the corresponding observation table are shown in figure. Which of the readings is inconsistent? December 5, 2020 Category: Arihant Physics by D.C Pandey [...]

In an experiment, the resistance of a material is plotted as a function of temperature (in some range). As shown in the figure, it is a straight line. One may conclude that: In an experiment it is a straight line. One may conclude that: the resistance of a material is plotted as a function of [...]

A metal wire of resistance 3 Ω is elongated to make a uniform wire of double its previous length. This new wire is now bent and the ends joined to make a circle. If two points on this circle make an angle 60∘ at the centre, the equivalent resistance between these two points will be [...]

In a conductor, if the number of conduction electrons per unit volume is 8.5 × 10^28 m ^–3 and mean free time is 25 fs (femto second), it’s approximate resistivity is : (me = 9.1 × 10^–31 kg) if the number of conduction electrons per unit volume is 8.5 × 10^28 m ^–3 and mean [...]