Potentiometer and Circuits with symmetry

Potentiometer is used to

In a potentiometer circuit, all the +ve terminals should be connected at

State the principle of potentiometer. Draw a circuit diagram used to compare the emfs of two primary cells. Write the formula used. How can the sensitivity of a potentiometer be increased.

In a potentiometer circuit, the emf of driver cell is 2V and internal resistance is 0.5 Omega . The potentiometer wire is 1m long . It is found that a cell of emf 1V and internal resistance 0.5 Omega is balanced against 60 cm length of the wire. Calculate the resistance of potentiometer wire.

In the given potentiometer circuit, the resistance of the potentiometer wire AB is R_(0). C is a cell of internal resistandce r . The galvanometer G does not give zero following cannot be a reason for this ?

In the given potentiometer circuit length of the wire AB is 3 m and resistance is R = 4.5 Omega . The length AC for no deflection in galvanometer is

In the following diagram the deflection in the galvanometer in a potentiometer circuit is zero. Then:-