A) \[0.3\,\,A\]
B) \[0.4\,\,A\]
C) \[0.1\,\,A\]
D) \[0.2\,\,A\]
Correct Answer: C
Solution :
We know that when current flow is same then resistors are connected in series, hence resultant resistance is \[R={{R}_{1}}+{{R}_{2}}=10\Omega +20\Omega =30\Omega \] Also since, cells are connected in opposite directions, the resultant emf is \[E={{E}_{1}}-{{E}_{2}}=5V-2V=3V\] From Ohm's law\[E=iR\] \[\Rightarrow \] \[i=\frac{E}{R}=\frac{3}{30}=0.1\,\,A\]
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