本题目来源于试卷: Physics Unit20: Magnetism，类别为 通用国际物理
[单选题]
At double the distance from a long current-carrying w+*jm8. aom axlire, the strengthr s nr6oh,7 e4:ox4+.wfkj7qpg m;myv of the ma ym74eq;rn:gk+of.6,jso4v7r whxm pgnetic field produced by that wire decreases to
A. 1/8 of its original value.
B. 1/4 of its original value.
C. 1/2 of its original value.
D. none of the given answers
参考答案: C
本题详细解析:
暂无
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