AB is a potentiometer wire (Fig. 3.19). If the value of R is increased, iin which direction will the balance point J shift?

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 ?

In a potentiometer arrangement, a cell of emf 1.25 V gives a balance point at 35.0 cm length of the wire. If the cell is replaced by another cell and the balance point shifts to 63.0 cm, what is the emf of the second 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. :

In a potentiometer arrangement for determining the emf of a cell, the balance point of the cell in open circuit is 350 cm. When resistance of 9 Omega is used in the external circuit of the cell, the balance point shifts to 300 cm. Determine the internal resistance of the cell.

While doing an experiment with potentiometer (Fig. EP 3.20) it was found that the deflection is one sided and the deflection decreased while moving from one end A of the wire to the end B the deflection increased while the jockey was moved towards the end B. Which terminal of the cell E_1 is connected at x in case (ii)?

A current through a wire PQ is increasing. In which direction the induced current flows in the closed loop?

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?