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 celj/i 2xvx( 2gxols are connected in 7c8.z wyfbz nw;x;xs3parallel to an external circuit conty8. ; c7fnzxxz3;wwbsaining a variable 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:

微信扫一扫，分享更方便