Why jockey should not be slided along the potentiometer wire?

A cell of e.m.f. 2 V and negligible internal resistance is connected in series with a potentiometer wire of length 100 cm. The e.m.f of the Leclanche cell is found to balance on 75 cm of the potentiometer wire. The e.m.f. of the cell is

A potentiometer has uniform potential gradient. The specific resistance of the material of the potentiometer wire is 10^(-7) ohm-metre and the current passing through it is 0.1 ampere, cross-section of the wire is 10^(-6)" m"^(2) . The potential gradient along the potentiometer wire is

When a force is applied along the length of the wire

The null point of a potentiometer wire will shift beyond the potentiometer wire if

What will be the effect on the position of zero deflection if only the current flowing through the potentiometer wire is Explain:- increased

What will be the effect on the position of zero deflection if only the current flowing through the potentiometer wire is:- decreased.

A potentiometer wire of Length L and a resistance r are connected in series with a battery of e.m.f. E_(0) and a resistance r_(1) . An unknown e.m.f. E is balanced at a length l of the potentiometer wire. The e.m.f. E will be given by :

In an experiment with a potentiometer V_B=10 V , R is adjusted to be 50 Omega as shown in figure. A student wanting to measure voltage E_1 of a battery (approx. 8 V) finds no null point possible. He then diminishes R to 10 Omega and is able to locate the null point on the last (4th) segment of potentiometer.Find the resistance of the potentiometer wire and potential drop per unit length across the wire in the second case.

A potentiometer has uniform potential gradient across it. Two cells connected in series (i) to support each other and (ii) to oppose each other are balanced over 6 m and 2 m respectively on the potentiometer wire. The e.m.f.’s of the cells are in the ratio of

The material of wire of potentiometer is