PASCO ES-9060 Charge, Equipotential and Field Mapper - Manual (Page 16)

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Model No. ES-9060 Charge, Equipotential, and Field Mapper
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source is a straight line at the left, the sink is a straight line at the right.
The tear-drop shaped section cut out of the middle is some obstruction.
The field lines are the corresponding streamlines.
Procedure:
To use the Field Mapper to examine field flows, follow these steps.
1. Make sure that the fluid is incompressible and the flow is not rotational
and steady.
2. Draw the electrodes on the conductive paper in the same shape and
position as the sources and the sinks in the flow.
3. Cut out the sections of the conductive paper in the same shape and
position as the obstructions in the fluid.
4. Connect a battery between the sources and the sinks. All sources
should be connected to the same side of the battery. All sinks
should be connected to the opposite side.
5. Plot the equipotentials and draw lines perpendicular to these. You
can also pick any point and determine the direction of the
maximum field gradient. This is the direction of the streamlines at
that point.