A lamp can work on a 50 V mains taking 2 A. The value of resistance must be connected in series with it so that it can be operated from 200 volt mains giving the same power is
2 points
25 Ω
75 Ω
100 Ω
50 Ω
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R = V/I
R = 50/2
R = 25 Ω
R = 50/2
R = 25 Ω
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