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範例:載流線圈在均勻磁場中的磁力與磁力矩[79日大]

由二直線段和半徑為ab的二同心半圓構成的導線,載電流為I(如圖),下列敘述何者正確? (A)半圓AED與半圓BFC兩部分導線在圓心O點產生的磁場大小相同,方向相反 (B)由半圓AED部分導線在圓心O點產生的磁場量值為(C)ABCD部分導線在圓心O點產生的磁場為零 (D)當外加一垂直於紙面均勻磁場Bo。於此導線處,則此導線所受磁力之量值為2iBo(a-b) (E)當外加一垂直於紙面的均勻磁場Bo於此導線處,則此導線所受力矩之量值為[註:必毆-沙伐定律為][79日大]


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Posted in 歷屆物理考題, 載流導線在磁場中的磁力.

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