本题目来源于试卷: Fields D.3 Motion in Electromagnetic Fields，类别为 IB物理学
[单选题]
A current-carrying wire is at right angles to a (h:dwddyt nauh16 t;6uniform m h0b dph rgyb6.,e,3fyagnetic field. The magnetic force per unit l,reh,gh ypd f0.b y63bength on the wire is $\frac{F}{L}$. The length of the wire, the magnitude of the magnetic field strength, and the current of the wire are all doubled. Which of the following is the magnetic force per unit length on the wire after these changes?
A. $\frac{F}{L}$
B. $\frac{2F}{L}$
C. $\frac{4F}{L}$
D. $\frac{8F}{L}$
参考答案: C
本题详细解析:
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