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Home » Physics Laboratory Instruments   »   Capacitance and Permittivity Kit
Capacitance and Permittivity Kit

Objective: To Study - Series and Parallel combination of capacitances. - Factors that determine the capacitance of a parallel plate Capacitor (area of overlap, distance between the plates and the medium). - Permittivity of Air

 
Capacitance And Permittivity Kit Capacitance and Permittivity Kit
Code: CPK-001

Capacitance and Permittivity Kit   

Objective: To Study - Series and Parallel combination of capacitances.
- Factors that determine the capacitance of a parallel plate Capacitor (area of overlap, distance between the plates and the medium).
- Permittivity of Air

Theory:
When a quantity of charge, Q, is transferred to the unearthed plate of a capacitor, the potential of the plate rises by V volts. The charge is given by

Q = C V           (1)

Where C is the capacitance in farads. If the capacitor is charged with a D.C. voltage V and discharged through a D.C. microammeter f times a second, the current passing through the ammeter is given in amperes by

I = f C V         (2)

Combining above two equations and substituting the values of the different component values of the kit, the above equations can be rewritten as:

The working of this kit is based on the above principle. Parallel plate is connected to the main unit and it is separated using the spacers provided with the setup and the corresponding current readings are tabulated as below:


S. No.

Thickness of spacers in meter (d)

Current in uA

1

t1

 

2

t2

 

3

t3

 

4

t4

 



A graph is plotted between I and 1/d and permittivity of air is calculated from the slope of the graph.

Capacitance and Permittivity Kit consists of the following parts:

The Kit consists of:

Main Unit having reed relay switch with A.C. supply, integrated circuit current amplifier and 0-100 micrometer
A pair of parallel plate capacitor
Perspex sheet
Set of Spacers (4 nos).