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Question
Why must the voltage supplied to a tungsten lamp be very stable?
Options:
A .  Because if it wasn't, the lamp would bum out
B .  Because amount of energy the lamp emits is proportional to the fourth power of the operating voltage
C .  Because the lamp will only function at a specific voltage
D .  All of the above
Answer: Option B
Answer: (b).Because amount of energy the lamp emits is proportional to the fourth power of the operating voltage

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