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

`4.5 V`

`1.5 V`

`2.67 V`

`13.5 V`

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