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.
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![Laser Module, Green, 1003202 [U22001], Light Sources on Stem](/thumblibrary/U22001/U22001_01_140_140_Laser-Module-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)
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(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)
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