試題詳解

16. The figure shows an array of identical real batteries, each with emf 0.050 V and internal resistance 0.20 ohm. There are 400 branches, each with 200 batteries. What is the current ( A ) through the external resistor, which has resistance R = 0.40 Ω?

(A) 2.5,
(B) 5.6,
(C) 20,
(D) 12,
(E) 58.