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  • In the given circuit, a meter bridge is shown in a balanced state,the bridge wire has a resistance 1/cm. The value

In the given circuit, a meter bridge is shown in a balanced state,the bridge wire has a resistance 1\Omega/cm. The value of  unknown resistance X (in \Omega) is

Option: 1

4


Option: 2

2


Option: 3

6


Option: 4

8


Answers (1)

As we learnt

 

Meter bridge -

 

\frac{P}{Q}=\frac{R}{S}\Rightarrow S= \frac{(100-l)}{l}R

- wherein

AB=l

BC=(100-l)

 

 

For the balanced bridge, the ratio of two resistances is equal to the ratio of the lengths of the two part AJ and JB of the wire

i.e.\frac{X}{6}=\frac{40cm}{60cm}\: \: or\: \: X=4\Omega

Posted by

Sumit Saini

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