本题目来源于试卷: Physics Unit20: Magnetism，类别为 通用国际物理
[单选题]
A thin copper rod 1.0 m long has a 8 pog2c7q6v,ht,zcf c i qio/ xkq6e6,ml; ,eeedc2+47x f+lyr(ddzyz ep8d)q ass of 0.050 kg and is in a magnetic field of 0.10 T. What minimum current in the rod is needed in order for ,d ye;8)fzlplx2dereez4 +dd 7 (y+cqthe magnetic force to cancel the weight of the rod?
A. $1.2 \; A$
B. $2.5 \; A$
C. $4.9 \; A$
D. $9.8 \; A$
参考答案: C
本题详细解析:
暂无
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