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Let the parallel plate capacitor have plates of area A and separation d. The original capacitance without the dielectric is When a dielectric slab of thickness d/2 and dielectric constant K=4 is inserted, the capacitor can be considered as two capacitors connected in series: 1. A capacitor with air (or vacuum, K=1) and plate separation d/2. Its capacitance
2. A capacitor with the dielectric (K=4) and plate separation d/2. Its capacitance
The effective capacitance Ceff of two capacitors in series is given by:
Therefore the correct answer is option (A).
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