A) 1 V
B) 1.5 V
C) 2 V
D) 3 V
Correct Answer: A
Solution :
Equivalent resistance \[R=4+\frac{3\times 6}{3+6}=6\Omega \] and main current \[i=\frac{E}{R}=\frac{3}{6}=0.5A\] Now potential difference across the combination of 3W and 6W, \[V=0.5\times \left( \frac{3\times 6}{3+6} \right)=1Volt\] The same potential difference, also develops across 3W resistance.
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