railway RRB JE (CBT I + CBT II) Mock Test 2024 Utilization of Electrical Energy Illumination

Find the luminous output of lamp if the wattage of the filament lamp 550 W and the efficiency of lamp is 2 candle power per W.

1
4100 π
2
4200 π 
3
4300 π 
4
4400 π 
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