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Question

a parallel plate condenser is made of 36 plates separated by paper 0.01mm thick. The area of each plate is 450 cm sq. Dielectric constant of paper is 2.5. Calculate the capacitance of the condenser.

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Solution

Capacitance of one capacitor = kεoAdarea = 450 cm2 = 450×10-4 m2distance = 0.01 mm = 0.01 ×10-3m2C = 2.5×8.85×10-12×450×10-40.01×10-3C = 9.9×10-8 faradas all 36 capacitors are connected in series net capacitance 1Cnet = 36CCnet = 0.02 ×10-8 faradCner = 2 μ farad

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