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Two resistance $\mathrm{X}$ and $\mathrm{Y}$ are connected in the two gaps of a meterbridge and the null points is obtained at $20\mathrm{cm}$ from zero end. When the resistance of $20\Omega$ is connected in series with the smaller of the two resistance $\mathrm{X}$ and $\mathrm{Y}$, the null point shifts to $40\mathrm{cm}$ from left end. The value of smaller resistance in ohm is