The wire of potentiometer is made of

A potentiometer is an ideal voltmeter since a voltmeter draws some current through the circuit while potentiometer needs no current to work. A potentiometer works on the principle of emf comparison. In working condition, a constant currant flows throughout the wire of a potentiometer is made of uniform material and cross-sectional area, and it has uniform resistance per unit length. The potential gradient depends upon the current in the wire. A potentiometer with a cell of emf 2 V and internal resistance 0.4 Omega is used across the wire AB . A standard cadmium cell of emf 1.02 V gives a balance point at 66 cm length of wire. The standard cell is then replaced by a cell of unknows emf e (internal resistance r ), and the balance. Point found similarly turns out to be 88 cm length of the wire. The length of potentiometer wire AB is 1 m . The value of e is

In the circuit shown, a four-wire potentiometer is made of a 400 cm long wire, which extents between A and B . The resistance per unit length of the potentiometer wire is r/L=0.01 Omega//cm. If an ideal voltmeter is connected as shown with jockey J at 50 cm from end A, the expected reading of the voltmeter will be :

In the circuit shown, a four-wire potentiometer is made of a 400 cm long wire, which extends between A and B. The resistance per unit length of the potentiometer wire is r = 0.01 Omega //cm . If an ideal voltmeter is connected as shown with jockey J at 50 cm from end A, the expecteed reading of the voltmeter will be _______ volts.

The potentiometer wire is made of _______

The material of wire of potentiometer is

The material of wire of potentiometer is