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 Ohms law \[E=iR\] \[\Rightarrow \] \[i=\frac{E}{R}=\frac{3}{30}=0.1A\]
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