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Help me understand! In the given meter bridge experiment,the circuit diagramand the corresponding observation table are shown in fig.Which of the reading is inconsistent?

In the given meter bridge experiment,the circuit diagram 

and the corresponding observation table are shown in fig.

Which of the reading is inconsistent? 

  • Option 1)

    3

  • Option 2)

    2

  • Option 3)

    4

  • Option 4)

    1

 
Answers (1)
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Meter bridge -

It works on the principle of wheat stone bridge

-

 

 

Meter bridge -

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

- wherein

AB=l

BC=(100-l)

 

 For meter bridge balanced condition

\frac{R}{X}=\frac{l}{100-l}

=> {X}=R(\frac{100-l}{l})

for (1) {X}=10^{3}\times \frac{40}{60}=666\Omega

for (2) {X}=10^{2}\times \frac{87}{13}=669\Omega

for (3) {X}=10\times \frac{98.5}{1.5}=656\Omega

for (4) {X}=1\times \frac{99}{1}=99\Omega

From this , we can conclude that observation (4) is inconsistent.


Option 1)

3

Option 2)

2

Option 3)

4

Option 4)

1

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