A) 1
B) 1/2
C) 2/1
D) None of these
Correct Answer: C
Solution :
\[\text{Power}=\frac{W}{t}.\] If W is constant then \[P\propto \frac{1}{t}\] i.e. \[\frac{{{P}_{1}}}{{{P}_{2}}}=\frac{{{t}_{2}}}{{{t}_{1}}}=\frac{20}{10}=\frac{2}{1}\]
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