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], Optical Precision Bench D](/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], Photoconductivity](/thumblibrary/U22017/U22017_01_140_140_Polarisation-Filter-on-Stem.jpg)
![Optical Precision Bench D, 1000 mm, 1002628 [U10300], Zeeman Effect – Accessories](/thumblibrary/U10300/U10300_01_140_140_Optical-Precision-Bench-D-1000-mm.jpg)
![Optical Precision Bench D, 500 mm, 1002630 [U10302], Optical Precision Bench D](/thumblibrary/U10302/U10302_01_140_140_Optical-Precision-Bench-D-500-mm.jpg)
![Universal Jaw Clamp, 1002833 [U13261], Clamp and Crocs](/thumblibrary/U13261/U13261_01_140_140_Universal-Jaw-Clamp.jpg)
![Set of 15 Experiment Leads, 75 cm 1 mm², 1002840 [U13800], Experiment Leads and Cables](/thumblibrary/U13800/U13800_01_140_140_Set-of-15-Experiment-Leads-75-cm-1-mm.jpg)
![Set of 15 Safety Experiment Leads, 75 cm, 2.5 mm², 1002843 [U138021], Franck-Hertz – Accessories](/thumblibrary/U138021/U138021_01_140_140_Set-of-15-Safety-Experiment-Leads-75-cm-25-mm.jpg)
![Tube Holder S -
for the experimental setup of tubes of series S, 1014525 [U185002], Accessories – Type S](/thumblibrary/U185002/U185002_01_140_140_Tube-Holder-S-for-the-experimental-setup-of-tubes-of-series-S.jpg)
![Diode Laser, 650 nm, red, 1003201 [U22000], Light Sources on Stem](/thumblibrary/U22000/U22000_01_140_140_Diode-Laser-650-nm-red.jpg)
![Laser Module, 532 nm, Green, 1003202 [U22001], Light Sources on Stem](/thumblibrary/U22001/U22001_01_140_140_Laser-Module-532-nm-Green.jpg)
![DC Power Supply,
0 – 20 V, 0 – 5 A (115 V, 50/60 Hz), 1003311 [U33020-115], Power Supplies](/thumblibrary/U33020-115/U33020-115_01_140_140_DC-Power-Supply-0-20-V-0-5-A-115-V-5060-Hz.jpg)
![Spectrum Tube Power Supply
(115V, 50/60 Hz), 1000683 [U418001-115], Spectrum Tubes](/thumblibrary/U418001-115/U418001-115_01_140_140_Spectrum-Tube-Power-Supply-115V-5060-Hz.jpg)
![Plexiglas Plate, 1000880 [U8476371], Electrostatics](/thumblibrary/U8476371/U8476371_01_140_140_Plexiglas-Plate.jpg)
![Accessories for Faraday Effect, 1012861 [U8496420], Prisms](/thumblibrary/U8496420/U8496420_01_140_140_Accessories-for-Faraday-Effect.jpg)
![Pair of Pole Shoes D, 1000978 [U8497200], Demountable Transformer D](/thumblibrary/U8497200/U8497200_01_140_140_Pair-of-Pole-Shoes-D.jpg)
![Teslameter E, 1008537 [U8533982], Magnetic Fields](/thumblibrary/U8533982/U8533982_01_140_140_Teslameter-E.jpg)
![Analogue Multimeter ESCOLA 100, 1013527 [U8557380], Hand-held Analog Measuring Instruments](/thumblibrary/U8557380/U8557380_01_140_140_Analogue-Multimeter-ESCOLA-100.jpg)
![Sensor Cable, 1021514 [UCMA-BTsc1], Additional Accessories for Computer-aided Experimentation](/thumblibrary/UCMA-BTsc1/UCMA-BTsc1_01_140_140_Sensor-Cable.jpg)
![Experiment: Malus’ Law , 8000687 [UE4040100], Polarisation](/thumblibrary/UE4040100/UE4040100_01_140_140_Experiment-Malus-Law.jpg)