Magnetic Field Experiment... The sensor used in this experiment uses the Hall Ef

Question

Magnetic Field Experiment...

The sensor used in this experiment uses the Hall Effect to detect the presence of magnetic fields. How does this relate to the systematic error of the magnetic field sensor? What is the source of this systematic error?

4. Start up the laptop and open the PHYS 4B LABS folder on the desktop. 5. Double-click on the Magnetic Field Sensor.cap file. 6. Press the green "TARE" button and then click on the red Record" button 7. Turn on the power supply and slowly increase the current to a value of 1.3 Amps Record the actual value of current 8. Allow the magnetic field to be measured continuously for an additional 5 seconds. 9. Click on the red "Stop" button. 10. Highlight the appropriate d points to determine the systematic error present. Record its mean value 11. Highlight the appropriate data points corresponding to the non-zero current in the wire. Record the following values about the magnetic field magnitude: i. Mean value ii. Standard deviation of the mean iii. Number of data points 12. Repeat the previous measurements for the approximate wire currents of 1.8 A and 2.3 A 13. Slowly decrease the current to a value of 0 Amps and then turn off the power supply. 14. Disconnect the single wire circuit and connect instead the single loop circuit 15. Measure the diameter of the single loop 16. Repeat the previous measurements of magnetic field strength (a the same currents as before). 17. Slowly decrease the current to a value of 0 Amps and then turn off the power supply. 18. Disconnect the single loop circuit and connect instead the solenoid circuit 19. Measure the length of the solenoid 20. Repeat the previous measurements of magnetic field strength (a the same currents as before). 21. Slowly decrease the current to a value of 0 Amps and then turn off the power supply. 22. Close the Magnetic Field Sensor.cap file 23. Double-click on the Magnetic Field Graphs.cap file 24. Edit the each of the three PASCO Capstone graphs, of magnetic field magnitude versus wire current, using data from the appropriate portion of the experiment Insert a linear trendline to the data for each graph 25. Print out a copy of each graph

Explanation / Answer

Hall voltage=I*B/ned

I current , B =magnetic field , n chareg density, e electron charge and d thickness of conductor

The measurement of large magnetic fields (Tesla) is often done by making use of the Hall effect. A thin film d Hall probe is placed in the magnetic field and the transverse voltage is measured.

In this case I is steady current and n,e, d are almost fixed, so it must be able to calculate B precisely

So, mean value and stadard deviation is taken.if the stadard deviation is much more for B for a large data set.

If stadnard deviation is not within the permissible limit. Then, high standard deviation indicates systemic error.

Hence, can be improved by either zero offset current at I=0. need to measure current when current is flowing when current is not flowing.

I-V characteristics should be linear

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