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It takes 4 minutes to boil a quantity of water electrically. How long will it...

Physics
WAEC 1988
It takes 4 minutes to boil a quantity of water electrically. How long will it take to boil same quantity of water using the same heating coil but with the current doubled? (neglecting any external heat loss).
  • A. 64 minutes
  • B. 32 minutes
  • C. 8 minutes
  • D. 2 minutes
  • E. 1 minute
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Correct Answer: Option E
Explanation
D ∝ l2
E will increase 4 times when current is doubled.
Therefore time will decrease by a factor of 4, which is 1 minute.
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