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If ${R_1}$ and ${R_2}$ are respectively the filament resistances of a $200$ $watt$ bulb and $100$ $watt$ bulb designed to operate on the same voltage, then
  • A${R_1}$ is two times ${R_2}$
  • B${R_2}$ is two times ${R_1}$
  • C${R_2}$ is four times ${R_1}$
  • D${R_1}$ is four times ${R_2}$
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