A) 4.5 V
B) 4 V
C) 0 V
D) 2 V
Correct Answer: A
Solution :
\[i=\frac{E}{R+r}=\frac{5}{4.5+0.5}=1A\] \[V=E-ir=5-1\times 0.5=4.5\,\text{Volt}\]
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