Hall effect Definition and 131 Threads

Hi all, I am reading about hall effect measurements and analysis from an old physics book, A. C. Melissinos, Experiments in Modern Physics, for a lab class I'm taking. An experiment involving hall and resistivity measurements of a p-type germanium sample is performed and discussed. He notes...

Homework Statement Hi all, I'm currently working on a Hall effect lab in which I analyze a p-type sample of germanium (I know it's p-type because I observe a hall voltage inversion point around 350 K which can only happen for a p-type sample). From the Hall and resistivity data I can obtain...

Homework Statement I am using the a hall effect sensor - model 480-5198-ND. I have tested this simple circuit using a LED and it is working. However, it is "ON" by default. Only when the magnet is near the hall effect sensor , it will be "OFF". How do I make it such that it is OFF by default...

In this video , he shows the basic of hall effect sensor. At the video 1:46 , he shows the latch effect of hall effect sensor. Does this latch comes with the hall effect sensor? What I mean is built into the chip? or he did something to it? This is not a homework or assignment question. I am...

I need help explaining that this assumption is not correct or correct: A product uses Radio waves to turn on a LED. Radio waves can be a form of electromagnetic fields therefore, a Hall Effect sensor could be used in this device to turn on that LED.

Why does the presence of an energy gap in QHE guarantee dissipationless current flow?

Hi everybody, As part of my research at UCSD, we are trying to measure Hall resistance of some materials. And to do that we need to send an AC current. So I wondered how we could easily build an ac current source, probably based on op-amp. I know there is the Howland circuit (current pump), but...

Why is a slab of semiconductor used instead of just a basic resistor. The charge would be pushed to either side by the magnetic field in the same way, would it not?

Homework Statement In a probe that uses the Hall effect to measure magnetic fields, a 11-A current passes through a 1.33-cm-wide and 1.31-mm-thick strip of sodium metal. If the Hall emf is 2.42 μV, what is the magnitude of the magnetic field (take it perpendicular to the flat face of the...

I'm having trouble understanding why the resistivity behaves as it does in comparison to the density of states for the quantum hall effect. Take the following two diagrams: (A) (B) I understand that there can be no scattering in (A) because all states are full (i.e. no elastic) and the gap is...

If i have a current of both negative and positive charges(i know that there is also current from only negative and only positive charges,i'm not confused) along an infinite wire of square cross-section,and the we put a homogeneous magnetic field normal to the current,then a Lorentz force acts on...

In this experiment you will use the Hall Effect to measure the strength of magnetic fields. Which of the following are true statements about the Hall Effect? (Select all that apply.) The Hall probe that we will use in this lab is made of a semiconductor. (check- i know this is one) The value...

So my textbook is explaining the hall effect and the following equation was derived: ∆VH=vd·B·W But if you look at the diagram, it appears that vd is pointing both ways. So which direction is vd pointing in? Or is this because electrons in the opposite direction is the same thing as holes in...

Hi , I need a good book or lecture on quantum hall effect. my supervisor wants me to find the Hamiltonian for the Qunatum hall effect, he want me to find this from this relation if it looks like a 2nd order differential of harmonic oscillation. can you please guide me doing this? $$H=...

1. Lab Method The method for determining the Hall Effect is as follows: This is the method that I was instructed to follow: A current source was connected across a germanium wafer The voltage across the wafer (in the direction of current) was measured with a multimeter A magnetic field was...

Evening gents, We've built the following circuit in the lab for our DC-DC converter for an electric motorcycle. The blocks from left to right are, High speed optoisolator IR2110 Gate driver IC MOSFET Power buffer circuit MOSFET Power Module PMDC Motor ~48V...

I have been carring out an experiment in which I have to measure the hall voltage in two samples given to me, which are Bismuth and Copper. The Hall voltage values of Bismuth come out as expected but when I measure hall voltage in the copper sample, I do not get any changes in the hall voltage...

The idea behind the Hall effect is according to my book that the magnetic field induces a charge distribution such that there is more positive charge on one side and more negative on the other. This induces a potential difference. But the question is: Is this the correct way to view it? I mean...

Homework Statement The lab is attached. I've also attached the pre-lab just for the diagram. Homework Equations The Attempt at a Solution Can anyone think of some good errors for this lab? We ended up with ~80% error. I've thought of two: 1. Adjusting the potentiometer so...

How do the effects of semiconductor semiconductor doping affect the Hall effect? For instance, consider number 4 and 5 in the following sample: Using the right hand rule, B points downwards, conventional current points to the right (because of the 5V battery), and therefore, the force...

In the regular hall effect we calculate like this F=qE=qvB then E=vB , now we assume our conductor has width d so we multiply both sides d. then Ed=vBd=V so now our Hall voltage is vBd v is the speed of the charge carriers and B is the magnetic field. But what if our charge carriers...

Hi, I am trying to create a hall effect based position sensor to be attached onto a DC motor to generate feedback for position control. I am thinking of the following arrangement: 4 hall sensors are placed 90 degrees apart around the magnetic element. Each sensor surface is directed at the...

Hello, I was taught that moving charges in an external magnetic field experience force. Okay. I wondered that if the observer was moving with the same velocity as the charge is what would happen? I studied in one book about field transformation and came to know that the charge will...

I know NOTHING about electronics like this. However, I am taking on a small project. I have a question that you can probably answer in half a second. I bought a few HE sensors, which are on their way. I need to know what activation sensitivity this HE sensor has in Gauss...

What cases can the hall effect happen? While reading this source. It states : "This is most evident in a thin flat conductor..." So, can this occur with a copper of wire? In any shape or form? Or only flat thick whole spaded conductors?

In p-type semiconductor the charge carriers are said to be positive, that is electron hole. But still isn't the electrons are movoing ? If positives move to the right that means that in reality electrons are moving to the left. Then how is it that the hall effect experiment for p-type...

how to interpret this equation physically? Why increase of B will lead to increase of V? Similar to I,n,e and t thx a lot

Homework Statement I'm trying to estimate the error in measurements of a homogenous magnetic field of known orientation using a Gauss-meter that uses a Hall-effect probe. The uncertainty in the measurements reported by the Gauss-meter are given the user's manual. Since the probe is held by...

I had a problem understanding the hall effect for flow of holes... I thought flowing of holes means that the electrons are flowing the opposite direction,leaving open holes and that's it... but when reading hall effect I couldn't explain the hall effect for electrons and holes... Suppose holes...

Hi! I'm having trouble understanding the quantum hall effect, that is, the fact that the Hall resistance versus magnetic field curve has regions where it drops to zero, and the longitudinal resistance versus magnetic field curve features plateaus. When the filling factor is an integer, this...

Help please! Where can I start if I want to learn Quantum Spin Hall Effect? I have learned the some fundamental ideas of integer quantum hall effect by myself. Under this background, what more should I read? cause I really can't find any notes or videos that are teaching about QSHE. I am now in...

Hi, I was trying to measure DC link current on a switched mode power supply when I came across a quirk of my circuit. I'm using an LEM HX 03-p SP2 hall effect current transducer to measure current. I couple the output node of my current transducer to ground via a 2KΩ resistor. The device's...

Dear PFs I am facing a problem with finding a good Hall-effect magnetic flux sensor which should be fixed in the top of a probe working in a very intense magnetic field. The probe must be aligned to a certain degree with respect to the direction of the main field. The requested alignement...

Hi Guys, I'm currently doing my final year project which my title is to design a remote sensor to monitor home electrical apparatus by using hall effect sensor. I've build a basic circuit and amplifier to test my hall effect sensor ic ( linear) with a magnet. Everything works fine and now...

Is it possible to construct a hall effect transducer without the use of p-type semiconductors? I've been looking into the fundamental design of a hall effect sensor, and it generally comprises some amplification/thermal control bits and pieces that all are bound to the most important part, the...

Hello everyone! I have been on this website for quite a while, and found some interesting answers to many questions, and I decided to create an account to seek you help with a particular issue I encountered in my assignment. Please have a read, and thank you for any input! Homework...

We have an experiment on Hall Effect,in which we place a semiconductor material in the middle of a 2 poles of a magnet exactly in the middle so that a distance of 1 cm exists between the poles. Questions: 1.Why is a semiconductor placed?Will it make any difference with a metal? 2.Why a 1 cm...

(The topic was previously posted in Electrical Engineering forum) https://www.physicsforums.com/showthread.php?t=510793 The charge carriers in a current carrying wire subjected to a magnetic field will move to a side due to the Hall effect. But doesn't that also decrease the effective cross...

The charge carriers in a current carrying wire subjected to a magnetic field will move to a side due to the Hall effect. But doesn't that also decrease the effective cross section area through which the charge carriers are moving? Does the resistance increase? If so, how significant is it in...

hi everyone, first of all, sorry for my bad english! I've got a computer project from my physics teacher which is about hall effect, the problem says that we have: Drift velocity "Vd" , Depth of the plate "d" and magnetic field "B", now we want to calculate 2 things: first: changing...

Hello all, I am having a slight conceptual problem in rationalizing what happens when a current-carrying material is exposed to an orthogonal magnetic field. The Lorentz force experienced by the moving charged particle is generally given by (dropping directional notations for clarity): F = q(E...

Homework Statement A slab made of unknown material is connected to a power supply as shown in the figure. There is a uniform magnetic field of 0.5 tesla pointing upward throughout this region (perpendicular to the horizontal slab). Two voltmeters are connected to the slab and read steady...

Hi everybody! I'm studying the IQHE and I want to understand the rise of the diophantine equation. I read the thouless article but it was no so conclusive. I've also read the kohmoto article (phys rev B 1989) and he says that that property comes from the darboux theorem but i don't...

Hello there, I'm an undergrad in my 3rd year and I'm doing an investigation into the 'Preparation of Thin Films and their use in Hall Effect measurements.' We are making thin films of bismuth on glass (with pre drilled terminals) in a vacuum system. The way they suggest measuring the...

I am terrible with electric. I just need some guidance on reconfiguring a hall sensor to read the opposite input. I have an analog tachometer from the '80s that was used to sense a groove on a grounded, spinning disk. I want to use the probe (which has 3 wires) to sense a raised piece of...

Hello I recently bought a linear Hall effect sensor for measuring current, but I don't know how to make the circuit to measure the current, could anybody help me with this? Please tell me the circuit. By the way, I use the linear Hall effect sensor CSLA2EL by Honeywell. Thank you very much!

Homework Statement Hall measurements are made on a p-type semiconductor bar (X) μm wide and (Y) μm thick. The Hall contacts A and B are displaced (Z) μm with respect to each other in the direction of current flow of (I) mA. The voltage between A and B with a magnetic field of 10 kG (1kG =...

I did an experiment with Indium antimonide (InSb) in Liquid Nitrogen. I turned the sample one way in the B field and took a reading of the voltage (positive) and turned it 180 degrees and took a reading of voltage (positive, and a greater value). I use V_h = v1 - v2 / 2 and I get negative values...

Hello. I recently did a Hall effect experiment with InSb. I did it in two parts. The first with the sample at room temperature and the second immersed in liquid nitrogen. I need some help understanding my results. I used the fomula v_h = (v_1 - v_2) / 2 to work out the Hall voltage (v_h). v_1...

Homework Statement Hello guys, This is a practice exam problem and I am getting an answer i feel is definitely not right. Anyways here is the question... You are designing a system to measure the magnetic field generated by an electromagnet. This forms part of a feedback control system to...