With help of circuit diagram, explain how a meter bridge can be used to find unknown resistance of a given wire.

With the help of a circuit diagram, explain how a metre bridge is used to find the unknown resistance of a given wire.

What is the principle of a metre bridge ? With a circuit diagram, explain how a metre bridge can be used to determine an unknown resistance of a given wire.

With the help of circuit diagram explain how a metre bridge can be used to compare two unknown resistances.

What is potentiometer? With the help of circuit diagram, explain how a potentiometer can be used to compare the emf of two primary cells.