NEET Physics Current Electricity Questions Solved

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) 13.5 V

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