context: Mechanically controlled variable capacitors allow the plate spacing to be adjusted, for example by rotating or sliding a set of movable plates into alignment with a set of stationary plates. Low cost variable capacitors squeeze together alternating layers of aluminum and plastic with a screw. Electrical control of capacitance is achievable with varactors (or varicaps), which are reverse-biased semiconductor diodes whose depletion region width varies with applied voltage. They are used in phase-locked loops, amongst other applications.
question: সস্তা পরিবর্তনশীল তড়িত-ধারকগুলি কীভাবে একটি প্লাস্টিক এবং অ্যালুমিনিয়ামের স্তরগুলির মধ্যে পৃথকীকরণ দূরত্বকে পৃথক করে?
answers: with a screw