在如图所示的电路中,两个相同的小灯泡 L 1 和 L 2 分别串联一个带铁芯的电感线圈 L 和一个滑动变阻 器 R .闭合开关S后,调整 R ,使 L 1 和 L 2 发光的亮度一样,此时流过两个灯泡的电流均为 I .然后,断开S.若 t ′时刻再闭合S,则在 t ′前后的一小段时间内,正确反映流过L 1 的电流 i 1 、流过 L 2 的电流 i 2 随时间 t 的变化的图象是 ( )
【简答题】Last week when I was sitting in my office,I heard an elderly lady talking on the phone about her husband.Her husband’s name was Ed.He dropped her off for her doctor’s appointment and was going to park...
【简答题】Last week when I was sitting in my office, I heard an elderly lady talking on the phone about her husband. Her husband’s name was Ed. He dropped her off for her doctor’s appointment and was going to p...