Permeability and Permittivity of Air Experiments

PERMEABILITY AND PERMITTIVITY OF AIR EXPERIMENT SV244A

Exp-1 To measure the force between current carrying conductor and determine the permeability of air.
Exp-2 To measure the force of attraction between charged capacitor plates and determine the permittivity of air.
Exp-3 To verify the relationship of speed of light with permeability and permittivity of air.

High current power supply.
High voltage DC power supply.
Very sensitive coulomb and current balance.
Diode laser based optical lever.

Permittivity of air.
Null Method
Electrostatic force.
current balance
Coulomb law.
Parallel plate
Conductor.

Permeability and Permittivity of Air Experiments

Principle and Working:
Repulsive forces between two current carrying conductors, which is very small, is measured using a very sensitive balance technique based on a diode laser, scale and fractional weights to form an optical lever. This measurement is used to calculate permeability of air. Similarly small attractive forces between two charged capacitor plates is measured. This measurement is used to calculate the permittivity of air.
An indirect estimate of the speed of light can be made from the experimental values of permeability and permittivity which verifies the relationship.

Contents:

Cat. No.	Item Name	Qty.
SV244	Coulomb and current balance kit	1
SE1003	Power supply 0-30V DC, 0-20A	1
SEB02	Power supply 0-600V, 10mA	1
SG204	Weight box	1
SG110	Cylindrical base	2
CH829	Diode laser with adapter	1
SP134	Wooden scale	1
LP18	Connecting lead	2
C4178	Resistance module	1

Coulomb and Current Balance SV244
- SPECIFICATIONS A-Base dimension : 30cm x 35.5cm
     Leveling : 2 nos. threaded knobs
     Connection : 4mm safety socket
     Lever position : 25.5cm
     A sensitive balance with adjustable counterweight and an optical lever for measuring tiny forces by the null method.
  B-Straight conductor : L=33.5cm, dia.=3mm, Aluminium
     Straight conductor : L=26.5cm, dia.=3mm, Aluminium (U type)
     Max. current : 20Amp
  C-Parallel plate : 12.5cmx12.5cmx0.8mm (LxWxT)
     Material : Aluminium
     Max. current : 20Amp
  
  Scope of supply : Complete with base unit, pair of straight straight conductor, pair of parallel plates and plane mirror.
Power Supply 0-30V DC, 0-20A SE1003
- SPECIFICATIONS Input Voltage : 220V, ±5%, 50Hz AC
  Output Voltage : 0-30V
  Voltage Resolution : 0.1V
  Voltage Display : 2½ Digit LED
  Output Current : 0-20 Amp
  Current Resolution : 0.1 Amp
  Current Display : 2½ Digit LED
  Protection : Current-Limiter
  Primary fuse : 8 Amp
Cylindrical Base SG110
- SPECIFICATIONS Material : Ferrous
  Mount : Rod 10-14mm dia
  : Flat object up to 10mm
  Groove : Slide object, 30x10mm (LxW)
Diode Laser CH829
- SPECIFICATIONS Peak Wavelength : 635nm
  Operating voltage : 5V DC
  Operating current : 250mA
  Optical power : > 0.4-0.8mW
  Laser product : Class II
  Operating temp. : 0 - 40°C
  Storage temp. : -10 to 50°C
Weight Box SG204
- SPECIFICATIONS Weights : 1mg to 50gms (set of 8)
  Material : Nickel plated brass
  Fractional Weight : Aluminium, supplied in plastic box
  Housed in wooden box with a forcep.
Wooden Scale SP134
- SPECIFICATIONS Length : 50mm
  Accuracy : 1mm

PERMEABILITY AND PERMITTIVITY OF AIR EXPERIMENT SV244A

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