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 distancb+3 w:n.x t1c(aysii8niq 9iye fro 9qttxl;y 7x:+moogv co;nen))rq u +oey)u;7m a long current-carrying wire, the strength of the magn )xg)+7)xol+;9ycuqo;nynm oo:evr 7q t;ute etic 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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