Question

2. Give theory of wheatstones bridge method for
measuring resistances​

Answer 1

Wheatstone Bridge Principle

It works on the principle of null deflection, which means the ratio of their resistances are equal and hence no current flows through the circuit. Under normal conditions, the bridge will be in the unbalanced condition where current flows through the galvanometer.

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Answer 2

Answer:

Wheatstone bridge has four arms (resistors) and the ratio of two of the resistors is kept at a fixed value. The other two arms are balanced, one of which is the unknown resistor whereas the resistance of the other arm can be varied.