For a post office box, the graph of galvanometer deflection versus R (resistance pulled out of resistance box) for the ratio 100 : 1 is given as shown. Find the value of unknown resistance.

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From the graph, interpolating between + 5 divisions at 320 Ω and − 2.5 divisions at 326 Ω : Zero deflection at R = 324 Ω X = ( P Q ​ ) R = 100 1 ​ × 324 = 3.24 Ω

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