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Problem

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Textbook Expert
Textbook ExpertVerified Tutor
15 Jan 2022

Given information

It is given that :

A Wheatstone bridge has 4 resistance . 

They are:

The bridge is balanced and current through ammeter is 0

 

Step-by-step explanation

Step 1.

A Wheatstone bridge is an electrical circuit used to measure an unknown electrical resistance by balancing two arms of a bridge circuit, one arm of which includes the unknown component.

The following condition exists when the current through an ammeter is zero,

From this the unknown resistance is determined by using the formula:

 

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