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 cells are connected in parallel n7n;kgeji4h1 pw8n h-jj l3g lv /8(s:r0;,hrfaamr dzbr; x7 to an external circuit containing a variable resistm h(l 8;0/ad jxr:r,l73as jbf grvz;ror. 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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