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Explain : In Wheatstone's metre bridge e...

Explain : In Wheatstone's metre bridge experiment, the null point is obtained in the middle one-third of the wire.

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In Wheatstone's metre bridge experiment, major sources of error are the nonuniformity in the cross section of the bridge wire and the end resistance at the two ends of the wire. To minimize these errors, readings must be taken by adjusting the standard known resistance such that the null point is obtained close to the centre of the wire. Also, the measurments must be repeated with the standard resistance and the unknown resistance interchanged in the gaps of the bridge. When several readings are to be taken, the null points should lie in the middle one-third of the wire.
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