Explain the difference between a permanent magnet and an electromagnet.
What will be an ideal response?
Question 2
What is the theoretical evaporation rate?
A) 1 percent of the water supplied for every 10F of cooling
B) 5 percent of the water supplied for every 15F of cooling
C) 5 percent of the water supplied for every 10F of cooling
D) 0.5 percent of the water supplied for every 1F of cooling