Higher Physics Lab Electricity & Magnetism

#### DIELECTRIC CONSTANT SK042

Exp-1 To determine the capacitance of plate capacitor by charge measurement.
Exp-2 To measure the capacitance as a function of area of plates.
Exp-3 To measure the capacitance as a function of distance between the plates.
Exp-4 To determine the dielectric constant of different dielectric materials .

• Charge measurement by electrometer amplifier.
• All electrical connections are made using safety sockets.
• Capacitors plates are attached to insulated riders.
• Electrical safety tested.
• Capacitance.
• Dielectric Constant.
• Electric field.
• Permittivity.

Principle and Working:
The relation between capacitance C, charge Q and charging voltage E is given as C=Q/E. The capacitance of a parallel plate capacitor depends upon the distance d between the plates, area A of the plates and the nonconductive material (having dielectric constant er) between the plates. Thus capacitance is
C = εr ε0 A/d
Where ε0 = 8.85 x 10-12 As/Vm (permittivity in free space),
In present setup, the parallel plate are charged by 600 V DC power supply. The charge Q on the parallel plate is measured by electrometer amplifier as voltage. The distance between plate is adjusted by placing spacer on the edges of plate.

Contents:

 Cat. No. Item Name Qty. SEB03 Dielectric constant kit 1 SD003 Electrometer amplifier 1 SE067 Digital multimeter 1 SE080 Power supply ( 2-12 V AC/DC) 1 SEB02 High voltage power supply (0-600V DC) 1 SN200 Flexible plug leads (50 cm), black 4 SN203 Flexible plug leads (50 cm), red 4 SN207 Flexible plug leads (100 cm), yellow 3 R4589 Earthing lead (100 cm), green 1 C4341 Way switch 1 C4108 Capacitor module 0.01mF 1 C4179 Capacitor module 100nF 1 C4178 4.7 MΩ Resistance box 1