The visual represents a capacitor, a system made up of two conducting plates with equal charges, but with opposite signs, separated by an insulator or a vacuum. Inside it the intensity of the field is approximately uniform, equal at all points. You can alter the difference of potential between the plates or the distance between them. Observe how the value of the field intensity changes.


Can you express the mathematical relation there is between E, D and the d.o.p.? (a relation only valid in uniform fields).

Also observe how, for determined values of intensity, the insulator becomes a conductor and the charge jumps between the plates like a spark.


 



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