In the circuit shown in the figure, AB is a resistance wire of uniform cross-section in which a potential gradient of `0.01V^-1` exists.
If the galvanometer G shows zero deflection what is the e.m.f.`E_1` of the cell used?

In the circuit shown in the figure, AB is a resistance wire of uniform cross-section in which a potential gradient of 0.01Vcm^-1 exists. If the internal resistance of the deriver cell increases on some account, how will it change the balance point in the experiment?

In the circuit show in the figure E,F,G and H are cells of e.m.f. 2,1,3 and 1 V and their internal resistances are 2,1,3 and 1Omega respectively. Calculate the potential difference across the terminals of each of the cells G and H.

In the circit show in the figure E_1 = 3V, E_2 = 2V, E_3 = 1V and the resistances R = r_1 = r_2 = r_3 = 1Omega . Find the potential difference between the points A and B and the current through each branch.

With a certain cell, the balance point is obtained at 65 cm from the zero end of a potentiometer wire. With another cell, whose e.m.f. is less than that of the first by 0.1 V, the balance point is obtained at 60 cm. What is the e.m.f. of the first cell ?

Calculate the conductance and conductivity of a wire of resistance 0.01Omega area of cross-section 10^-4m^2 and length 0.1 m.

A cell of e.m.f. 4 V and of negligible internal resistance is connected in series with a potentiometer wire of length 400 cm. The e.m.f. of a Leelanche cell is found to be balacned at 150 cm from the positive end of the potentiometer wire. What is the e.m.f. of the Leclanche cell ?

The e.m.f of Daniel cell is 1.09 V and internal resistance is 2Omega . If the terminals of the cell are joined by a wire of resistance of 18Omega find the potential difference recorded by a higher resistance voltmeter also connected to the terminals of the cell.

Figure 3.35 shows a 2.0 V potentiometer used for the determination of internal resistance of a 1.5 V cell. The balance point of the cell in open circuit is 76.3 cm. When a resistor of 9.5 Omega is used in the external circuit of the cell, the balance point shifts to 64.8 cm length of the potentiometer wire. Determine the internal resistance of the cell. :

The resistivity of potentiometer wire is 10^-7 ohm m and its area of cross-section is 10^-6m^2 . When a current I = 0.1. A flows through the wire, its potential gradient is

A wire of length 0.1 m moves with a speed of 10 m s^-1 perpendicular to a magnetic field of induction 1 Wb m^-2 . What is the value of induced e.m.f.?