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2013年浙江高考理综第25题是物理部分的最后一道题,该题以军事技术——潜艇为背景,考察学生电磁驱动、功与能量转化关系等方面的知识,此题题材新颖,设计巧妙,不失为一道好题.但笔者认为该题第三问的参考答案存在不妥之处,现提出来与大家探讨.原题为了降低潜艇噪音,提高其前进速度,可用电磁推进器替代螺旋桨.潜艇下方有左、右两组推进器,每组由6个相同的、用绝缘材料制成的直线通道推进器构成,其原理示意图如图1.在直线通道内充满电阻率ρ=0.2Ω·m的海水,通道中
In 2013 Zhejiang college entrance examination science comprehensive question 25 is the physical part of the last question, the subject to military technology - submarine as the background, to examine the students of electromagnetic drive, power and energy conversion relations and other aspects of knowledge, this topic is novel, cleverly designed , But after all, a good question, but I think the third question asked the answer to the question there is something wrong, are presented to discuss with you. In order to reduce submarine noise and improve its forward speed, the propeller can be replaced by electromagnetic propulsion. Below the left and right two groups of thrusters, each group consists of six identical, linear channel propeller made of insulating material composition, the schematic diagram shown in Figure 1. In the straight channel filled with resistivity ρ = 0.2Ω · m The sea, in the channel