Purpose: The purpose of this experiment is to determine which orientation of magnets has the strongest magnetic field, in order to create a magnetically assisted impeller to make Reverse Osmosis water desalinization an efficient and viable option for obtaining clean, drinkable water.

Hypothesis: The augmented side of the Halbach array would have a stronger magnetic field than an equivalent number of magnets with an inline array, or the non-augmented side of the Halbach array; therefore, making the Halbach array better suited to assist a water jet impeller,

Experimental Design and Procedure: In my experiment, i made the Control where there was no magnet in the apparatus, and then just changed the orientation of magnets to test which orientation had the strongest pulling force and therefore the strongest magnetic field. The changes in X were the different magnet arrays and their orientation. The changes in Y were the strength of attraction of the magnet arrays to the steel plate. The experiment was successful in proving my hypothesis when, after testing all configurations five times, the data was still consistent, proving that the Halbach array's augmented side had the greatest magnetic attraction. I assembled the Halbach array and continuous polar array, and then tested each side of the Halbach array and the north and south poles of the continuous polar array.

Analysis of Data: I found that, as hypothesized, the augmented side of the Halbach array had the strongest magnetic force. However, unexpectedly, all 4 sides of the Halbach array had different strengths. I believe that imperfections in each individual magnet caused the strengths of each side to be different than expected. Also, on the continuous polar array, the north pole of the array was almost twice as strong as the south pole of the array. This makes sense because the magnetic field on the north pole of the array is assisted by all of the magnets in the array, while the parts of the magnetic field are pulled to the individual magnets on the way to the magnet's south pole.

Conclusion/Discussion: The purpose of this experiment was to find which orientation of magnets had the strongest magnetic field. As I had hypothesized, the augmented side of my Halbach array had the strongest magnetic field. However, the side opposite the augmented side did not have the weakest magnetic field as I had assumed. The data gathered on the Halbach array shows that it is the best magnetic array to assist the propulsion of an impeller in a water jet. This impeller would push the water through a carbon nanotube (CNT) aerogel filter that would remove the salt content in the water through reverse osmosis. Carbon nanotube filters are shown to possibly decrease the energy cost of desalinization by 75 percent and increase the flow rate over 100 times. The Halbach array assisted impeller and carbon nanotube filter used in conjunction will steeply decrease the cost of Reverse-Osmosis desalinization, making Reverse-Osmosis desalinization a viable, cost effective option for large and small scale water purification.