Objective: Determining the relative permittivity of various materials
Any insulating or poorly conducting material which lacks free charge carriers can act as a dielectric when an electric field passes through it. The material may be a gas, liquid or solid. The dielectric is polarised in the electric field. This polarisation can be induced (displacement) polarisation or orientational polarisation. In the experiment the voltage applied across a plate capacitor is measured both with and without cardboard or a transparent acrylic plate inserted between the capacitor’s plates. The dielectric constants of these intervening materials are obtained from the ratio of the measured voltages.
![Experiment: Dielectrics in plate capacitors (115 V, 50/60 Hz), 8000785 [UE3010850-115], Electrostatics](/imagelibrary/UE3010850-115/UE3010850-115_01_Experiment-Dielectrics-in-plate-capacitors-115-V-5060-Hz.jpg)
![Optical rider D , 90/50, 1002635 [U103111], Optics with an Optical Bench](/thumblibrary/U103111/U103111_01_140_140_Optical-rider-D-9050.jpg)
![Barrel Foot, 1 kg, 1002834 [U13265], Bases](/thumblibrary/U13265/U13265_01_140_140_Barrel-Foot-1-kg.jpg)
![Polarisation Filter on Stem, 1008668 [U22017], Optical Components on Stem](/thumblibrary/U22017/U22017_01_140_140_Polarisation-Filter-on-Stem.jpg)
![Optical Precision Bench D, 1000 mm, 1002628 [U10300], Optics with an Optical Bench](/thumblibrary/U10300/U10300_01_140_140_Optical-Precision-Bench-D-1000-mm.jpg)
![Optical Precision Bench D, 500 mm, 1002630 [U10302], Optics with an Optical Bench](/thumblibrary/U10302/U10302_01_140_140_Optical-Precision-Bench-D-500-mm.jpg)
![DC Power Supply, 32 V, 20 A (230 V, 50/60 Hz), 1012857 [U11827-230], Power Supplies](/thumblibrary/U11827-230/U11827-230_01_140_140_DC-Power-Supply-32-V-20-A-230-V-5060-Hz.jpg)
![Set of 15 Experiment Leads, 75 cm, 2.5 mm², 1002841 [U13801], Circuits](/thumblibrary/U13801/U13801_01_140_140_Set-of-15-Experiment-Leads-75-cm-25-mm.jpg)
![Set of 15 Safety Experiment Leads, 75 cm, 2.5 mm², 1002843 [U138021], Circuits](/thumblibrary/U138021/U138021_01_140_140_Set-of-15-Safety-Experiment-Leads-75-cm-25-mm.jpg)
![Projection Screen, 1000608 [U17130], Optical Components on Stem](/thumblibrary/U17130/U17130_01_140_140_Projection-Screen.jpg)
![Tube Holder S -
for the experimental setup of tubes of series S, 1014525 [U185002], Electron Tubes S](/thumblibrary/U185002/U185002_01_140_140_Tube-Holder-S-for-the-experimental-setup-of-tubes-of-series-S.jpg)
![High Voltage Power Supply 5 kV (115 V, 50/60 Hz), 1003309 [U33010-115], Power Supplies](/thumblibrary/U33010-115/U33010-115_01_140_140_High-Voltage-Power-Supply-5-kV-115-V-5060-Hz.jpg)
![DC Power Supply 20 V, 5 A
(115 V, 50/60 Hz), 1003311 [U33020-115], Power Supplies](/thumblibrary/U33020-115/U33020-115_01_140_140_DC-Power-Supply-20-V-5-A-115-V-5060-Hz.jpg)
![Flint Glass Block for Faraday Effect, 1012860 [U8474060], Prisms](/thumblibrary/U8474060/U8474060_01_140_140_Flint-Glass-Block-for-Faraday-Effect.jpg)
![Accessories for Faraday Effect, 1012861 [U8496420], Prisms](/thumblibrary/U8496420/U8496420_01_140_140_Accessories-for-Faraday-Effect.jpg)
![U-core D, 1000976 [U8497180], Demountable Transformer D](/thumblibrary/U8497180/U8497180_01_140_140_U-core-D.jpg)
![Coil D, 900 Turns, 1012859 [U8497390], Demountable Transformer D](/thumblibrary/U8497390/U8497390_01_140_140_Coil-D-900-Turns.jpg)
![Electric Field Meter (115 V, 50/60 Hz), 1001029 [U8533015-115], Electrostatics](/thumblibrary/U8533015-115/U8533015-115_01_140_140_Electric-Field-Meter-115-V-5060-Hz.jpg)
![Sensor Cable, 1021514 [UCMA-BTsc1], Additional Accessories for Computer-aided Experimentation](/thumblibrary/UCMA-BTsc1/UCMA-BTsc1_01_140_140_Sensor-Cable.jpg)
![Experiment: Faraday effect (230 V, 50/60 Hz), 8000689 [UE4040600-230], Polarisation](/thumblibrary/UE4040600-230/UE4040600-230_01_140_140_Experiment-Faraday-effect-230-V-5060-Hz.jpg)
![Experiment: Line Spectra (115 V, 50/60 Hz), Basic equipment, 8000705 [UE5020100-115], Atomic shells](/thumblibrary/UE5020100-115/UE5020100-115_01_140_140_Experiment-Line-Spectra-115-V-5060-Hz-Basic-equipment.jpg)