MCQ
In a meter bridge experiment, the circuit diagram and the corresponding observation table are shown in figure

$Sl$. $No$. $R\, (\Omega )$ $l\, (cm)$
$1$. $1000$ $60$
$2$. $100$ $13$
$3$. $10$ $1.5$
$4$. $1$ $1.0$

Which of the readings is inconsistent ?

  • $4$
  • B
    $3$
  • C
    $2$
  • D
    $1$

Answer

Correct option: A.
$4$
a
as $x=\frac{R(100-\ell)}{\ell}$

$\text { for (1) } \quad x=\frac{1000 \times(100-60)}{40} \approx 667$

$\text { for (2) } \quad x=\frac{100 \times(100-13)}{13} \approx 669$

$\text { for }(\mathrm{3}) \quad x=\frac{10 \times(100-1.5)}{98.5} \approx 656$

$\text { for (4) } \quad x=\frac{1 \times(100-1)}{1} \approx 95$

So reading in serial no. $(4)$ is completely different hence correct answer $(A).$

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