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在初中物理第二册“电磁铁”一节中,照217页图10—28所示装置来研究通电螺线管磁性强弱跟哪些因素有关时,由于电压低,通过的电流小,实验室螺线管匝数少,产生的磁场微弱,吸引铁块的力小,而弹簧弹性系数较大,伸长不显著,演示时学生看不清楚.而且空气对铁块的阻尼比较小,在螺线管每次通断电或改变电流强度后,铁块要在平衡位置附近上下振动一段较长时间才
In the Middle School Physics Volume II, “Electromagnets” section, follow the setup shown in Figure 10-28 on page 217 to see what factors contribute to the magnetic strength of the solenoid. Because of the low voltage and small current passed, the lab Small solenoid turns, weak magnetic field, small force of attracting iron, large elastic coefficient of spring, not obvious elongation, students can not see clearly when demonstrating, and the air has little damping on iron, Every time the line is powered off or the amperage is changed, the iron should vibrate up and down for a long time around the equilibrium position