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2015年北京高考物理试卷注重理论联系实际,注重考生学科素养和能力的考查,能力立意特色鲜明.第20题便是典型例子.原题.利用所学物理知识,可以初步了解常用的公交一卡通(IC卡)的工作原理及相关问题.IC卡内部有一个由电感线圈L和电容C构成的LC振荡电路.公交车上的读卡机(刷卡时“嘀”的响一声的机器)向外发射某一特定频率的电磁波.刷卡时,IC卡内的线圈L中产生感应电流,给电容C
2015 Beijing college entrance examination physics papers pay attention to the theory with practice, pay attention to the examinee’s academic quality and ability examination, ability conception distinctive characteristics of the first 20 questions is a typical example.Using the knowledge of physics, you can get to know the commonly used bus card IC card) of the working principle and related issues.IC card there is an internal inductance coil L and capacitance C composed of LC oscillator circuit .Bus card reader (credit card “beep ” sound of the machine) to Outside the launch of a particular frequency of electromagnetic waves .Card, the IC card within the coil L induced current, to the capacitor C