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,l0dd q,l ansgmn5 9gu5q+ sk6 long has a 9yao n6j; 56 ;.o(vvf ngofg)mc-haar mass 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 the magnetic force to cancel the weig aavfm)y6fo c;9n- oh;aj6rvgo5 n(g.ht 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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