本题目来源于试卷: Physics Unit20: Magnetism，类别为 国际高中通用物理
[单选题]
At what distance from a long straight wire carryin-/fif*mc h a5tg a current of 5.0 A is kvcljb) +,nh04bulg1 asa)3n the magnitude of the magnetic field due to the wire equal to the strength of the Earth's magnetic fi)c l143s b)k+jv 0nahn,bu lgaeld of about $5.0 \times 10^{-5} \; T$?
A. $1.0 \; cm$
B. $2.0 \; cm$
C. $3.0 \; cm$
D. $4.0 \; cm$
参考答案: B
本题详细解析:
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