A torch bulb rated as 4.5 W, 1.5 V is connected as shown in fig. The e.m.f. of the cell, needed tomake the bulb glow at full intensity is

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4.5 V

1.5 V

2.67 V

13.5 V

answer is D.

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Detailed Solution

Resistance of bulb Rb=(1⋅5)24⋅5=0⋅5ΩCurrent drawn from battery =E2⋅67+0⋅33=E3Share of bulb 23×E3=2E9∴ 2E92×0⋅5=4⋅5or E=13⋅5V

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