Help with magnetism- hall probes- difference between 3 types -

[Fairydust07]

Help with magnetism- hall probes- difference between 3 types -URGENT

Given 3 uncalibrated hall probes A, B, C, a solenoid of a known number of turns and length and a long straight wire. I have to discover which of 3 probes is a metal, a p-type semiconductor, and an n-type semiconductor.The n-type semiconductor has to be calibrated, and also need to investigate how the magnitude of the magnetic flux density (B) at a distance (r) away from a long straight wire carrying current (I) depends on the distance (r). Other apparatus in a school lab may be used...how do i go about doing this?...??...confused and stressed

 

[BigJDubs]

1. To determine which of the three Hall probes is a metal, a p-type semiconductor, and an n-type semiconductor, you will need to conduct some tests. Start by measuring the resistance of each probe. The metal probe will have the highest resistance, while the p-type and n-type semiconductor probes will have lower resistances.2. To calibrate the n-type semiconductor probe, you will need to use the solenoid of known length and number of turns. Place the probe inside the solenoid and measure the Hall voltage. This voltage should increase as the current through the solenoid is increased.3. To investigate how the magnitude of the magnetic flux density (B) at a distance (r) away from a long straight wire carrying current (I) depends on the distance (r), you will need to construct a circuit containing a current source and a Hall probe. Measure the Hall voltage at various distances from the wire and plot the values on a graph. From this graph, you should be able to determine the dependence of B on r.

 

[charng]

First of all, it is important to understand the basic principles of magnetism and how hall probes work. Hall probes are devices used to measure magnetic fields. They consist of a thin, flat piece of material (usually a semiconductor) with electrical contacts on either side. When a magnetic field is applied perpendicular to the plane of the material, a voltage is generated across the contacts, which can be measured and used to determine the strength of the magnetic field.

Now, let's address the three types of hall probes you have: metal, p-type semiconductor, and n-type semiconductor. The main difference between these types lies in the material used to make the probe. A metal hall probe is made of a conductive material such as copper or aluminum, while a semiconductor hall probe is made of a semiconductor material such as silicon or germanium. The difference between p-type and n-type semiconductors lies in the type of doping (adding impurities) used to create them. P-type semiconductors have a higher concentration of positively charged carriers (holes) while n-type semiconductors have a higher concentration of negatively charged carriers (electrons).

To determine which of your probes is made of which type of material, you can use the solenoid and long straight wire as a reference. A solenoid is a coil of wire that produces a magnetic field when current is passed through it. Place each probe in the magnetic field of the solenoid and measure the voltage across the contacts. A metal probe will produce a very small voltage, while a semiconductor probe will produce a larger voltage. To determine if it is p-type or n-type, you can use the long straight wire. Place the probe at different distances from the wire and measure the voltage. If the voltage decreases as the distance increases, it is an n-type semiconductor. If the voltage increases as the distance increases, it is a p-type semiconductor.

To calibrate the n-type semiconductor probe, you can use the same setup with the solenoid and long straight wire, but this time vary the current in the wire and measure the voltage at a fixed distance. Plot the voltage vs. current and you should get a straight line. The slope of this line will give you the calibration constant for the probe.

To investigate how the magnitude of the magnetic flux density (B) at a distance (r) from a long straight wire depends on the distance (r), you can use the same setup with the solenoid