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题如图所示,一根均匀的电阻丝的阻值为10Ω,把它绕成一个环形.环上部acb 的长度为 L_1,环下部 adb的长度为 L_2,为使 ab 两点的
As shown in the figure, a uniform resistance wire has a resistance of 10Ω and is wound into a ring. The length of the upper abb of the ring is L_1, and the length of the adb at the lower part of the ring is L_2, so that ab is two points.