🔍 Key Concepts

• Review the basic schematic symbols for inductors: air-core, iron-core, toroidal, and variable. • Notice that the symbol in figure 2 shows an inductor with additional lines above the coil – think about what those lines represent physically. • Compare how many separate windings or coils each physical component has, and whether there is an obvious magnetic core shape.

💭 Think About

• Ask yourself: do the parallel lines above the inductor symbol in figure 2 mean it has no core, a solid core, or something adjustable? • Look at each choice (A–D) and decide which one best represents a straight inductor on a magnetic core, not a variable inductor and not a transformer with clearly separate primary and secondary windings. • Consider whether a toroidal (donut-shaped) core is usually drawn with the same simple symbol as in figure 2, or has a more specialized symbol.

✅ Before You Answer

• Verify which standard schematic symbol corresponds to an iron-core (fixed) inductor – this should match the style of figure 2. • Check that the choice you select has one main coil winding on a straight magnetic core, rather than multiple separate windings like a transformer. • Confirm that your choice does not rely on features associated with a variable inductor (such as an arrow through the symbol), since figure 2 has no such marking.