What are the types of variable coils and how to connect them?

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new life

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how can connect the variable coil ? what r it's types?
and what does it use for?
 

Re: variable coil

Variable inductors are usually tuned by moving a magnetic rod in or out of the center with a screwdriver.
Usually used in radio circuits at the front end for matching the receiving antenna and tuning the resonant frequency.
 

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