Think of two different ways you could make a variable inductor. Explain/draw picture of each.
Variable inductors formed by moving the magnetic core in and outside of the inductor windings. By this magnetic core we can adjust the inductance value. When we consider a ferrite core inductor , by moving its core inside and outside on which the coil is wounded , variable ferrite core inductor can be formed.
Method 1
Use resistances before the inductor
2. Method
Use magnetic core moving inside and out inductor coil.
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