When the galvanometer reads zero the circuit is in the null-balance position. 當檢流計的讀數為零時(shí)，電路處于零平衡位置。
The bar would naturally tend to fall down from the top vertical position, which is a position of unsteady equilibrium. 棒子會(huì )有自然的趨勢從最高的豎直位置下落，那是一個(gè)不穩定的平衡位置。
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