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电磁振荡演示仪一般是由一个大电感线圈和一个电容器组成LC振荡电路,采用灵敏电流计来指示回路中电流的周期性变化。 由于采用电流计作指示器,振荡频率必须做得很低,为满足振荡条件,电容器的容量不能取得太大,这就势必要增大线圈的电感量。而一般电感量较大的线圈,其内阻不易做得很低,所以演示阻尼振荡时能观察到的振荡周期数太少,影响实验效果。
Electromagnetic oscillation demonstration instrument is generally composed of a large inductance coil and a capacitor LC oscillation circuit, the use of sensitive current meter to indicate the cyclical current change in the circuit. Since the current meter is used as an indicator, the oscillation frequency must be made very low. In order to satisfy the oscillation condition, the capacity of the capacitor cannot be made too large, and it is therefore necessary to increase the inductance of the coil. However, for a coil with a large inductance, the internal resistance of the coil is not easy to be low. Therefore, the number of oscillation cycles that can be observed during damping oscillation is too small to affect the experimental results.