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  • State the underlying principle of meter bridge. Draw the circuit diagram and explain how the unknown resistance of a conductor can be determined by this method.     <div style="float

State the underlying principle of meter bridge. Draw the circuit diagram and explain how the unknown resistance of a conductor can be determined by this method.

 

 
 
 
 
 

Answers (1)

Principle of meter bridge:-

It works on the principle of balance condition of the Wheatstone bridge.

Circuit diagram of meter bridge ;

When, the jokey is moved along the wire, at one position of jokey, the galvanometer will show no deflection.

let the distance of the jokey from the end A at the balanced point be l_{1} then 

\frac{P}{Q}=\frac{R}{S}

\frac{R}{S}=\frac{l_{1}}{100-l_{1}}                     \left ( \because p=l_{1}\; \; and\; \; Q=100-l_{1} \right )

Hence, R=S\left ( \frac{l_{1}}{100-l_{1}} \right )

Posted by

Safeer PP

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