Which of the following can cause the null point of a potentiometer to shift beyond the wire ?

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

The sensitivity of potentiometer wire can be increased by

In an experiment with a potentiometer, V_(B)=10V . R is adjusted to the 50Omega (figure). A student wanting to measure voltage E_(1) to a battery (approx. 8V) finds no null point possible. He then diminishes R to 10Omega and is able to locate the null point ont he last (4th) segment of the potentiometer. find the resistance of the potentiometer wire and potential drop per unit length across the wire in the second case.

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

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.

When null point is obtained in the potentiometer the current is drawn from

When null point is obtained in the potentiometer the current is drawn from

Can we use copper wire as potentiometer wire ? Explain.