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 conkg.x8px w,k -0aq(turnected inh5fz:q,jzz nhc -h)) k parallel to an external circuit containing a vhq nzkzjh fh5c:-)z ),ariable resistor. 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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