Magnetic susceptibility of FeCl3 solution by Quinck's method

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Seminar On Magnetic
Susceptibility of
FeCl3 Solution
By- Mr. Vinayak Sutar
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Point to discuss
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Theory
Magnetic susceptibility
Simply the magnetic
susceptibility of material is defined as ratio of
the intensity of magnetisation to the magnetic
intensity. ?
Magnetisation/magnetic intensity
M/H
M is the magnetization of
the material
H is the intensity of magnetic field


In other words ,the intensity of
magnetization I induced at any point in a body
is proportional to the strength of the applied
field H. Ik H
where,
kproportionality constant and called

as magnetic susceptibility In S.I unit
magnetic susceptibility has dimensionless unit,
but in c.g.s system the unit is emu/gm.
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Method of Measuring Magnetic Susceptibility
Method
Applicable to
Diamagnetic and paramagnetic only
Dia-,para- and ferro- magnetic materials
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Diamagnetic material Paramagnetic material Ferromagnetic material
Susceptibility is negative and is independent of temperature. Susceptibility is positive and small .It is inversely proportional to the absolute temperature Susceptibility is positive and large. It is dependent of temperature.
The Quincke Method

• Consisting 'U' shape tube.
• There is reservoir at one arm to drop solution.
  While other arm of tube is placed magnetic field.
• When this tube is placed in magnetic field, the
  solution level increases or decreases.
• Paramagnetic solution show an increase in height
  of solution level , while diamagnetic solution
  show a decrease in height of solution level.
• 
  

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If ? and ?0 are the densities of
the solution and an air above solution
respectively , then the hydrostatic pressure g(?
- ?0)h is balanced by the magnetic force
1/2 H2(k-k0) .
where ,
H applied magnetic field
k k0
susceptibility of solution and
an air over
the meniscus.
h change in height
Therefore,
½ H2
(k-k0) g(? - ?0)h As density
of an air very small , it neglects Therefore,


½ H2 (k-k0) g?h
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Experiment
Aim To determine the magnetic
susceptibility of FeCl3 solution by
using different concentration of FeCl3
solution and to find
susceptibility of water.
Apparatus Magnet with dc power supply,
U-tube, Travelling Microscope,
FeCl3.6H2O solution of different
concentrations as N/8, N/4
3N/4 and N/2
Diagram
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Formula
1/2 (k-k0)H2 2?gh
Where, HIntensity of magnetic
field, ? Density of solution,
k Susceptibility of solution, k0
Susceptibility of an air 0.03
10-6 emu/gm hRise in solution
level.
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Procedure
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Current (I) Amp Magnetic Intensity(H)
0 0
0.25 1074
0.50 2070
0.75 3160
1.00 4160
1.25 5240
1.50 6140
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Observation table
Obs. No. Concentration of solution (N) Density (gm/cc) Current Through magnet (Amp) Microscopic reading Microscopic reading hh1h2 (cm) Susceptibility k (emu/gm)
Obs. No. Concentration of solution (N) Density (gm/cc) Current Through magnet (Amp) h1 h2 hh1h2 (cm) Susceptibility k (emu/gm)
1. 1.00 1.192 0.5
1. 1.00 1.192 1.0
1. 1.00 1.192 1.5
2. 0.750 1.15 0.5
2. 0.750 1.15 1.0
2. 0.750 1.15 1.5
3. 0.500 1.11 0.5
3. 0.500 1.11 1.0
3. 0.500 1.11 1.5
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Graph of Susceptibility v/s Concentration
Susceptibility (emu/gm)
Concentration (N)
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Result
Sr. No. Concentration (N) Magnetic Susceptibility (emu/gm)
1.
2.
3.

• Magnetic susceptibility of water
  _____________ emu/gm

Conclusion
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Some Application of Magnetic Susceptibility
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Thank You . . .