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A parallel plate air-filled capacitor having area 35 cm2 and plate spacing 1.2 mm is charged to the potential difference of 740 V. Determine (i) the capacitance in pico farads, (ii) the magnitude of the charge in nano-coulombs on each plate, (iii) the stored energy in micro-joules, (iv) the electric field in N/C among the plates, (v) the energy density among the plates.

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