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Capacitor have thin conducting plates (usually made of metal) separated by a layer of dielectric, then stacked or rolled to form a compact device. Many types of capacitors are available commercially, with capacitors ranging from the Pico farad range to more than a farad, and voltage ratings up to many kilowatts. In common, the higher the capacitance and voltage rating, the bigger the physical size of the capacitor and the higher the cost. Tolerances in capacitances value for discrete capacitors are usually specified as a percentage of the nominal value. Tolerances ranging from 50% (electrolytic types) to less than 1% are commonly available. Another figure of advantage for capacitors is stability with respect to time and temperature, at times called drift. Variable capacitors are generally less stable then fixed types.
A model elevator A working model of an elevator can simply be made from easy materials. For the rotating drums or sheaves, metal coffee tin will do. With a hammer and a big nai
A crown glass prism has refractive indices 1.575 and 1.585 for blue and red colours. Determine its dispersive power. What are the basic conditions for a pair of thin prisms to p
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Can you explain lens maker's formula. Derive the mathematical expression for the effective focal length of two thin lenses in contact.
What kind of batteries are used in TL coachees. Briefly explain about each one of them? Ans. In TL coaches two kind of batteries are used. They are SMF and VRLA batteries.
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