用霍尔法测直流磁场的磁感应强度时，霍尔电压的大小（）

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【单选题】【消耗次数：1】

① 与霍尔材料的性质无关；

② 与外加磁场的磁感应强度的大小成正比；

③ 与霍尔片上的工作电流IS的大小成反比；

④ 与霍尔片的厚度d成正比；

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