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3.Current Electricity
medium
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 ?
A
$4$
B
$3$
C
$2$
D
$1$
(JEE MAIN-2019)
Solution
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 $(A).$
Standard 12
Physics
