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How To Find Charge On Positive Plate Change After Dielectric Is Added

Question

A 12 V battery is connected to a capacitor with 2.0 cm x 2.0 cm parallel plates, separated by a 0.1 mm air gap. While the capacitor is connected to the circuit, the space between the plates is filled with a dielectric slab with dielectric constant 4.5. How much does the charge on the positive plate change (in nano-coulombs) after the dielectric is added?

 

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    Giuseppe

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