电容器虽不属教学的重点,但近年高考中平行板电容器的命题频率较高,在含有平行板电容器的电路中,改变电容器两板间距离d、正对面积s、两板间的电介质都会改变电容,从而引起极板带电量Q、板间场强E、两板电势差U、板间某点电 Capacitors are not the focus of teaching, but in recent years, the propositional frequency of parallel plate capacitors in the college entrance examination is relatively high. In circuits with parallel plate capacitors, changing the distance d between the two plates of the capacitor, the area s, and the dielectric between the two plates will change. Capacitance, resulting in plate charge Q, plate-to-plate field strength E, potential difference between two plates U, a point between the plates