Dielectric Constant of A Capacitor

The relationship between capacitance C, charge Q and voltage V is described by ratio C=Q/V.
The capacitance of a parallel plate capacitor depends on distance “d” between its plates, on area A of plates and on the insulating material between the plates and especially on its dielectric constant.
The first test concerns the measurement of charge Q of the capacitor versus voltage V.
Consequently, capacitance is determined as slope of Q-vs-V curve.
The measurement will be carried out at a fixed distance “d” with different areas of plates, in the second test. Distance can be varied by steps of 1 mm.
The variation of distance “d” between plates of constant area A will confirm proportionality Cαa1/d, in the third test. The permittivities of two different dielectrics (polystyrene and glass) between the capacitor plates will be determined in the fourth test.

TRAINING PROGRAM
Determining the capacitace of a plate capacitor by measuring its charge
Measuring capacitance versus the area of plates
Measuring capacitance versus the distance between plates
Determining the dielectric constant of different materials

COMPONENTS
Kit of dielectric constant
Electrometer amplifier
Digital multimeter
Flexible cables
KIT OF DIELECTRIC CONSTANT
It includes a rail with a scale of 0-10 cm printed on a side, 2 wide plates and 2 small plates for capacitor, spacers of PVC, pane of glass and plate of polystyrene, capacitive module.
DISASSEMBLABLE CAPACITOR
Area of (aluminium) plates : 400 mm2, 800 mm2 Intervals : variable, 1, 2, 3, 4, 6 mm Pane of glass: 21 x 21 cm Plate of polystyrene : 21 x 21 cm
ELECROMETER AMPLIFIER
Electrometer ampplifier used to measure the charge Input impedance > 1013 Ω Input current ≤ï€ 0.5 pA Output voltage: up to +10 V Output current: 5 mA Output impedance = 1 Ω Supply voltage: 12 Vac
DIGITAL MULTIMETER
Resistance range: 200 Ω, 2000 Ω, 20 k Ω, 200 k and 2000 k Ω DC voltage: 200 and 2000 mV 20, 200 and 1000 V AC voltage: 200 and 750 V Direct Current: 200, 2000 μA 20 and 200 mA 10 A

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