Particulate Nature of Matter B.5 Electric Circuits (id: 896a19677)

本题目来源于试卷: Particulate Nature of Matter B.5 Electric Circuits，类别为 IB物理学

[单选题]
In the following circuit, two celfwjba: srlvh1 ilr/,3.np. 9 yls are connected in pm w su1.al.p(5jzs dg(arallel to an external circuit containing a variable resistor.ald1s.js(( g wzu p5m. The emf of each cell is 3.0 $V$ and the internal resistance (shown) of each is 5.0 Ω.


If the variable resistor is set at 7.5 Ω, what is the current in the external circuit?

A. 0.1A
B. 0.15A
C. 0.3A
D. 0.5A


参考答案:  C


本题详细解析:

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