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