Answer: The correct option is (B) 0.5.
Step-by-step explanation: We are given to use the following equation to determine the current (I) when the R is 20 ohms.
[tex]I=\dfrac{10}{R}~~~~~~~~~~~~~~~~~~~~~~(i)[/tex]
When R = 20 ohms, then from equation (i), we get
[tex]I=\dfrac{10}{R}\\\\\\\Rightarrow I=\dfrac{10}{20}\\\\\\\Rightarrow I=\dfrac{1}{2}\\\\\\\Rightarrow I=0.5.[/tex]
Thus, the required current (I) is 0.5.
Option (B) is CORRECT.
