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1.测细金属丝的直径将细金属丝均匀地密绕在粗细均匀的铅笔上,用刻度尺测出一段细金属丝在铅笔上(螺旋状)的长度为 L,数出这一段螺旋状细金属丝的匝数为 n.(直径为D=L/n)
1. Measure the diameter of the thin metal wire. The fine metal wire is evenly and tightly wound around a pencil with a uniform thickness. Use a graduated ruler to measure the length of a thin metal wire on the pencil (helical), and count the length of the spiral. The number of turns of fine wire is n. (diameter is D=L/n)