(24-39) Suppose one plate of a parallel-plate capacitor is tilted so it makes a small angle θ with t

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(24-39) Suppose one plate of a parallel-plate capacitor is tilted so it makes a small angle θ with the other plate, as shown in Fig. 24-28. Determine a formula for the capacitance C in terms of A, d, and θ, where A is the area of each plate and θ is small. Assume the plates are square. [Hint: Imagine the capacitor as many infinitesimal capacitors in parallel.]
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ı do not understand the last step of solution . how can we eliminate ln

turanpaksoy