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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

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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

(1)  4.5 V

(2)  1.5 V

(3)  2.67 V

(4)  13.V

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Correct option  (4) 13.5 V

Explanation:

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