Question Video: Identifying the Appropriate Material for a Transformer Physics • 9th Grade

Which of the following is a suitable material for the core of a transformer? [A] Copper [B] Aluminium [C] Polypropylene plastic [D] Iron [E] Carbon

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Video Transcript

Which of the following is a suitable material for the core of a transformer? (A) Copper, (B) aluminium, (C) polypropylene plastic, (D) iron, or (E) carbon.

To answer this question, let’s first remember that a transformer consists of two solenoids that are linked by a common core. The purpose of this core is to redirect the magnetic fields to the solenoids and allow a more efficient transfer of energy from one coil to the other. So, if this core is supposed to redirect magnetic fields, it makes sense that it needs to be made from a magnetizable substance. If it wasn’t made from a magnetizable material, it wouldn’t do anything to affect the magnetic fields of the solenoids.

So, to answer this question, we simply need to identify which of the materials we’re given is a magnetizable substance. First, we can recall that only certain metals are magnetizable. So, we can rule out any nonmetallic materials straightaway. This means we can rule out polypropylene, a kind of plastic, and also carbon, which is not a metal. This leaves us with copper, aluminium, and iron, all of which are metals.

However, not all metals are magnetizable. Of these three, only iron is actually magnetic. The other two are not magnetizable. So, we can eliminate these options as well.

This leaves us with only one option, iron. Iron is a magnetizable metal and is a common material for use in transformers. So, the correct answer to this question is option (D). Iron is a suitable material for the core of a transformer.

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