$A$ student obtained the following observations in an experiment of a meter bridge to find the unknown resistance of the circuit. The most accurate value of the unknown resistance is ............ $\Omega$.
$S.No.$ $R$ $l$ $100-l$ $S = \left( \frac{100-l}{l} \right)R$ $1$ $20\,\Omega$ $43$ $57$ $26.51\,\Omega$ $2$ $30\,\Omega$ $51$ $49$ $28.82\,\Omega$ $3$ $40\,\Omega$ $59$ $41$ $27.80\,\Omega$ $4$ $60\,\Omega$ $70$ $30$ $25.71\,\Omega$
| $S.No.$ | $R$ | $l$ | $100-l$ | $S = \left( \frac{100-l}{l} \right)R$ |
| $1$ | $20\,\Omega$ | $43$ | $57$ | $26.51\,\Omega$ |
| $2$ | $30\,\Omega$ | $51$ | $49$ | $28.82\,\Omega$ |
| $3$ | $40\,\Omega$ | $59$ | $41$ | $27.80\,\Omega$ |
| $4$ | $60\,\Omega$ | $70$ | $30$ | $25.71\,\Omega$ |
- A$26.51$
- B$28.82$
- C$27.80$
- D$25.71$
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