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How do magnetic fields affect the rate of flow of water?

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on 9 January 2014

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Transcript of How do magnetic fields affect the rate of flow of water?

To better understand how the magnetic field from a magnet will affect the rate of flow of water through a narrow passage.

Diamagnetism pertains to a class of substances, as bismuth and copper, whose permeability is less than the permeability of a vacuum: in a magnetic field, their induced magnetism is in a direction opposite to that of iron. Diamagnetic material weakens the magnetic field. Water is an example of a diamagnetic because it has the ability to repel the magnetic field from an external permanent magnet. The weakening of the magnetic field is magnified when salt water is used, meaning the higher the salinity the weaker the field becomes. The magnet also causes water’s flow rate to slow down.

If you use a magnet that has a strong magnetic field then the salt solution will have a slower flow rate than the regular tap water.

1. The independent variables of this science fair project is the type of water used (salt solution and tap water) and whether the a magnetic field is or is not present. The dependent variable is the time taken for the fluid to flow out of the burette. This is measured using a stopwatch. The constants control variables are the amount of water used, the strength of the permanent magnet used, the flow rate of the burette and the room temperature.
2. Fill 200ml of tap water into the measuring cylinder. This is then poured into the burette. The flow rate of the burette is set and the same conditions will be used for the subsequent experiments.
3. The time taken for the 200 ml of tap water to flow out of the burette (without any magnetic field applied) is measured. Repeat this process up to 5 times and the average time taken will be calculated and recorded in the table provided below. .
Procedure continued:
4. Step 4 is repeated by placing 2 permanent magnets at the bottom of the burette as shown in figure 1. This measurement is again, repeated 5 times for us to obtain the average timing required, which will be recorded in the table provided below.
5. Mix 50 grams of salt with 200 ml of tap water in a separate beaker. Using the measuring cylinder, pour 200 ml of salt solution into the burette. Repeat steps 4 and 5 using the salt solution. The average timing taken for 5 tests are calculated and recorded in the table provided below.

How do magnetic fields affect the rate of flow of water?

The hypothesis was correct that the salt water would slow down the flow rate more than the tap water would.
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