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In a metre bridge , null point is obtain...

In a metre bridge , null point is obtained at `42.1"cm"` on the wire when a `3Omrga` resistance is kept in the left gap and a `4Omega` resistance in the right gap of the bridge . The null point is shifted towards right by 15.0 cm when the two resistance are interchanged . Determine the end error of the bridge .

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The correct Answer is:
2.9 cm ,2.1 cm
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