A) 40 W in series and 100 W in parallel
B) 100 W in series and 40 W in parallel
C) 40 W both in series and parallel will be uniform
D) 100 W both in series and parallel will be uniform
Correct Answer: A
Solution :
\[\frac{{{R}_{1}}}{{{R}_{2}}}=\frac{{{P}_{2}}}{{{P}_{1}}}=\frac{100}{40}=\frac{5}{2}\]. Resistance of 40 W bulb is \[\frac{5}{2}\] times than 100 W. In series, \[P={{i}^{2}}R\] and in parallel, \[P=\frac{{{V}^{2}}}{R}\]. So 40 W in series and 100 W in parallel will glow brighter.
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