A 
lamp is to be operated on a 120 V D.C. line. For proper glow, a resistor of ohm should be connected in series with the lamp.
Text Solution
Verified by ExpertsThe correct answer is:
D
Resistance of the lamp, 
Current in the lamp, 
.
When lamp is operated on a 
,
then resistance 
.
For proper glow, the resistance required to be put in a series will be
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