Investigating The Behaviour Of Equipotential And Electric Field Lines Between Two Electrodes
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E1 - Electrostatics (Potential & Field)
Date: 26th of August 2014
Partners: Luke Silveira and Tivanka Anandappa
This practical involved investigating the behaviour of equipotential and electric field lines between two electrodes (which represented the a parallel plate capacitor). Furthermore the effect of adding a conductor and an insulator between the two electrodes was explored to determine the electric potential produced from these configurations.
The setup involved three of paper with low conducting teledeltos paper on top to allow the marker to locate the potential at different points between the parallel plate. The power supply provided the potential difference of 10V between the two plates and thus etched marks…show more content… From this relationship, it insinuates that potential decrease linearly with distance.
Equipment2: Power supply - to supply power to the electrodes Multimeter- measure the potential difference Wooden box - base for the parallel plate Two stainless steel clamps - used as the two electrodes Marking probe - to sketch the equipotential lines Stainless steel disc - used as the insulator and conductor Three types of paper Plain A4 photocopy paper - to record equipotential line markings Carbon paper -imprint the markings onto plain A4 Teledeltos paper - low electrical conducting material
Results and Analysis
Ideal parallel plate capacitor has electric field lines that are perpendicular to the plates surface (between the two plates) and also perpendicular to the equipotential lines.
Diagram 1 (expected)
This value was determined based on numerous measurements of the fluctuating voltages and 0.1V was deemed a suitable value.
U(V) Multimeter: +-0.1V
Distances were measured using a 30 cm ruler with 1mm increments. Thus the uncertainty involved is
U(d) Distance: +-0.0005m
U(E)=U(V)/U(d) =0.1/10/0.005/0.168 =0.339 =+-0.3 V/m
From linest, the total uncertainty =+-3V/m
The linear equation  E = ∆Vc/d can be used to calculate the theoretical electric field by subbing in the values of ∆Vc as 10V and the