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Calibrating instruments…
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Storing charge — plates, dielectrics and the energy in the field.
Build a parallel-plate capacitor you can actually operate: slide the plates closer, change their overlap, and push a dielectric slab between them while a capacitance meter reads C = κε₀A/d live. Charge it from a cell and watch the energy ½CV² fill the field, then combine capacitors in series and parallel to see the totals emerge.
Beyond the open showcase, subscribed schools get the growing library of Capacitance experiments — searchable, tagged by concept and difficulty, and expanding continuously.