A) \[0.5\Omega \]
B) \[0.8\Omega \]
C) \[1.0\Omega \]
D) \[0.2\Omega \]
Correct Answer: A
Solution :
[a] Given: emf \[\varepsilon =2.1V\] \[I=0.2A,R=10\Omega \] Internal resistance \[r=?\] From formula. \[\varepsilon -Ir=V=IR\] \[2.1-0.2r=0.2\times 10\] \[2.1-0.2r=2\text{ or }0.2r=0.1\] \[\Rightarrow r=\frac{0.1}{0.2}=0.5\Omega \]
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