For the same potential difference, a potentiometer wire is replaced by another one of a high specific resistance. The potential gradient then (`r=R_h=0`)

The potential gradient of the potentiometer wire depends on

Why should be the material of the potentiometer wire be of high specific resistance?

In a potentiometer, potential difference across the potentiometer wire is directly proportional to its

If the value of potential gradient on potentiometer wire is decreased, then the new null point will be obtained at

If the value of potential gradient on potentiometer wire is decreased, then the new null point will be obtained at

A cell with considerable internal resistance is connected directly across the terminals of the potentiometer wire. The potential gradient is now 'G'. Now the potentiometer wire is replaced by another wire of same material but double the length and having the same radius as that of the original wire. The new potential gradient on the wire with the same cell connected as before is (A) G/2 (B) G (C) G/2

The potentiometer wire is replaced by another wire whose length thickness and specific resistance are double the previous one. The current strength flowing through it is also doubled. How many times will the potential gradient becomes

As is the cross sectional area and rho is the specific resistance of a potentiometer wire. If I is the current passing through the potentiometer wire, then the potential gradient along the length of the wire is given by