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(a) Draw a circuit diagram of a meter bridge used to determine the unknown resistance R of a given wire. Hence derive the expression for R in terms of the known resistance S. (b) What does the term 'end error' in a metre bridge circuit mean and how is it corrected ? How will the balancing point be affected, if the positions of the battery and galvanometer are interchanged in a metre bridge experiment ? Give reason for your answer. |
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Answer» <P> Solution :We know that, `P/Q = R/S` (POTENTIOMETER) Here,`""l_(1)/(100-l_(1)) = P/Q` ` rArr"" l_(1)/(100-l_(1)) = R/S` or `"" R=S[l_(1)/(100 - l_(1))]` (b) Theshifting of zero of thescale at different points, as well as thestray resistance give rise to enderror in metre BRIDGE wire. This error arises due to non-uniformity of metre wire. Correction can be estimated by including known resistances `P_(1) and Q_(1)` in thetwo ENDS andfinding the null point. If galvanometer and battery are interchanged, there is no effect on the position of balance point. |
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