Question

what is the principle of working system of metal Bridge

Answer 1

May be u are asking, working principal of meter bridge- wheatstone bridge

Answer 2

Explanation:

Meter Bridge Notes

Meter Bridge works on the principle of Wheatstone Bridge. The former is an actual physical lab apparatus while the latter is an electrical circuit. Your meter bridge experiment readings for both the resistance of the unknown wire (S) and length of the wire (l) are computed as the mean values