1. The problem statement, all variables and given/known data (see attached problem) 2. Relevant equations (see attached problem) 3. The attempt at a solution So assuming the area of the hole is circular, halving its diameter, will decrease its area by a factor of 16. Therefore LI will be I/16? However in the solution (see attached solution) it says: 'Halving the diameter of the hole will decrease the power through it by 1/4'. How does one make this conclusion?