A) 2 : 1
B) 1 : 2
C) 4 : 1
D) 1 : 4
Correct Answer: A
Solution :
Both R and 2R in parallel ( V ? constant) So using \[P=\frac{{{V}^{2}}}{R}\] Þ \[\frac{{{P}_{1}}}{{{P}_{2}}}=\frac{{{R}_{2}}}{{{R}_{1}}}\] Þ \[\frac{{{H}_{1}}}{{{H}_{2}}}=\frac{{{R}_{2}}}{{{R}_{1}}}=\frac{2}{1}\]
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