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Hall effect experiment:- Determination of charge carrier density
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## Procedure:

### Combo box

Select procedure: This is used to select the part of the experiment to perform.

1) Magnetic field Vs Current.
2) Hall effect setup.

Select Material: This slider activate only if Hall Effect setup is selected. And this is used to select the material for finding Hall coefficient and carrier concentration.

### Button

Insert Probe/ Remove Probe: This button used to insert/remove the probe in between the solenoid.

Show Voltage/ Current: This will activate only if Hall Effect setup selected and it used to display the Hall voltage/ current in the digital meter.

Reset: This button is used to repeat the experiment.

### Slider

Current : This slider used to vary the current flowing through the Solenoid.

Hall Current: This slider used to change the hall current

Thickness: This slider used to change the thickness of the material selected.

### To measure the magnetic field generated in the solenoid

• Select Magnetic field Vs Current from the procedure combo-box.

• Click Insert Probe button

• Placing the probe in between the solenoid by clicking the wooden stand in the simulator.

• Using Current slider, varying the current through the solenoid and corresponding magnetic field is to be noted from Gauss meter.

Trial No: Current through solenoid Magnetic field generated
1
2
3
4

Table(1)

### Hall Effect apparatus

•  Select Hall Effect Setup from the Select the procedure combo box

• Click  Insert Hall Probe button

• Placing the probe in between the solenoid by clicking the wooden stand in the simulator.

• Set "current slider" value to minimum.

• Select the material from “Select Material” combo-box.

• Select the Thickness of the material using the slider  Thickness.

• Vary the Hall current using the sllider  Hall current.

• Note down the corresponding Hall voltage by clicking “show voltage” button.

• Then calculate Hall coefficient and carrier concentration of that material using the equation

RH=VHt/(I*B)

Where RH is the Hall coefficient

RH=1/ne

And n is the carrier concentration

•  Repeat the experiment with different magnetic file.

Trial

No:

Magnetic Field

(Tesla T)

Thickness (t)

m

Hall current,

mA

Hall Voltage

mV

RH
1
2
3
4
5

Procedure for doing real lab

• Connect ‘Constant current source’ to the solenoids.
• Four probe is connected to the Gauss meter and placed at the middle of the two solenoids.
• Switch ON the Gauss meter and Constant current source.
• Vary the current through the solenoid from 1A to 5A with the interval of 0.5A, and note the corresponding Gauss meter readings.
• Switch OFF the Gauss meter and constant current source and turn the knob of constant current source towards minimum current.
• Fix the Hall probe on a wooden stand. Connect green wires to Constant Current Generator and connect red wires to milli voltmeter in the Hall Effect apparatus
• Replace the Four probe with Hall probe and place the sample material at the middle of the two solenoids.
• Switch ON the constant current source and CCG.
• Carefully increase the current I from CCG and measure the corresponding Hall voltage VH. Repeat this step for different magnetic field B.
• Thickness t of the sample is measured using screw gauge.
• Hence calculate the Hall coefficient RH using the equation 5.
• Then calculate the carrier concentration n. using equation 6.

### Result

 ﻿Hall coefficient of the material﻿ ﻿= .........................﻿ ﻿Carrier concentration of the material﻿ ﻿=.......................... ﻿ m-3

Cite this Simulator:

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