论文部分内容阅读
1991年全国统一高考物理试题,就其兼顾高等学校选拔人才与有利于中学教学来看,是一份较好的试题,但从研究、评价命题的角度出发,我认为有几道题考虑欠周到,值得探讨、推敲,今特谈谈自己的浅见。第17题:恒定的匀强磁场中有一圆形的闭合导体线图,线圈平面垂直于磁场方向。当线圈在此磁场中做下列哪种运动时线圈中能产生感生电流? (A)线圈沿自身所在的平面做匀速运动。 (B)线圈沿自身所在的平面做加速运动。 (C)线圈绕任意一条直径做匀速转动。 (D)线圈绕任意一条直径做变速转动。“试题答案”是“C、D”,但不少考生在选择C、D的同时还选择了B.分析其原因,在于选项B的情况中,圆形闭合导线等效于二根并联的导体棒,它在
In 1991, the national unified college entrance examination physics test questions were a better test for the sake of taking into account the selection of talents in higher education and teaching in favor of middle school teaching. However, from the perspective of researching and evaluating propositions, I think there are several problems to consider. It is worth exploring and scrutinizing. I would like to talk about my own views. Question 17: There is a circular closed conductor pattern in a constant uniform magnetic field. The plane of the coil is perpendicular to the direction of the magnetic field. What kind of motion can occur in the coil when the coil does the following in this magnetic field? (A) The coil moves at a uniform speed along its own plane. (B) The coil is accelerating along its own plane. (C) The coil rotates at a constant speed around any diameter. (D) The coil rotates around any diameter. The “question answer” is “C, D”, but many candidates chose C and D at the same time they chose B. The reason for the analysis is that in the case of option B, the round closed conductor is equivalent to two parallel conductors. Stick, it’s in