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T6C10
What is component 3 in figure T-3?

Pick an answer to check it.
Answer: D. Variable inductor
Component 3 in Figure T-3 is a coil (a row of loops) with an arrow tapping into it. A coil is an inductor, and the arrow shows its value can be adjusted, so it is a variable inductor.
Tip: Coil plus arrow = variable inductor.