[填空题]
An unknown length of platinum wire 0.920 mm in d3+r5jqf+hq.ae gl ) uliameter is pl3czruy b948 f86lf 0gwdd0flyaced as the unknown resistance in a Wheatstone bridge (see Probldy 9ff ugdflb6w8 c8zly400 r3em 71;Fig. Below). Arms 1 and 2 have resistance of $38.0\Omega$ and $46.0\Omega$ respectively. Balance is achieved when $R_3$ is $3.48\Omega$ How long is the platinum wire? m
