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A torch bulb rated as $4.5\, W$, $1.5\, V$ is connected as shown in the figure. The $e.m.f.$ of the cell needed to make the bulb glow at full intensity is ................ $V$
  • A$4.5$
  • B$1.5$
  • C$2.67$
  • D$13.5$
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