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A torch bulb rated 4.5 W, 1.5 V is conne...

A torch bulb rated `4.5 W, 1.5 V` is connected as shown in Fig. 7.35. The emf of the cell needed to make the bulb glow at full intensity is

A

4.5 V

B

1.5 V

C

2.67 V

D

13.5 V

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