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In the above circuit, The fuse wire melts when

Physics
JAMB 1991

In the above circuit, The fuse wire melts when

  • A. K is Opened
  • B. K is closed
  • C. the 14 ohm resistor is doubled with k closed
  • D. the 6 ohm resistor is doubled with k closed
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Correct Answer: Option B
Explanation

K is closed: This is when the current exceeds the 2 A rating of the fuse, causing it to melt.

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