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Statement of a problem № 3772

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In a Wheatstone bridge, four resistors P, Q, R and S are arranged as in Fig. 12.18. Show that (a) condition for null deflection in the galvanometer G is P/Q=R/S (b) if a non-zero current ig flows through the galvanometer then ig/i=(QR-PS)/(G(Q+S)+(P+R)(G+Q+S))

Solution:
In a Wheatstone bridge, four resistors P, Q, R and S are arranged as in Fig. 12.

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