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d. 1:3. ..............
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I guess that there is some mistake ...but if it is given like this then the ratio we will get as 1210:500
= 121 : 50
Explanation:
For the time being, I guess it should be like this,
Equation of power in terms of voltage and resistance is
P = V^2/R Or
R = V^2/P
R1 = 220^2/40 = 1210 ohm
R2 = 110^2/20 = 605
R1 : R2 = 1210 : 605
R1 : R2 = 2:1
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