The constituents of permallory are Iron and

Analyze the question: The question asks which metal is combined with iron to make the alloy permalloy (spelled "permallory" in the question).

Concept: Permalloy is a well-known magnetic alloy. It has very high magnetic permeability, which is where the name comes from: permeability + alloy. It is used in transformer cores, magnetic shielding, and recording heads.

Composition: Permalloy is made of iron and nickel. A typical mix is about 80% nickel and 20% iron.

Checking the options:

• A. Nickel: Correct. Permalloy is an iron-nickel alloy.
• B. Tin: Tin is used in solder (with lead) and in bronze (with copper). It is not in permalloy.
• C. Chromium: Chromium is added to iron to make stainless steel (iron, chromium and nickel). It is not part of permalloy.
• D. Copper: Copper is found in brass (with zinc) and bronze (with tin). It is not part of permalloy.

Answer: A. Nickel

Exam tip: Link alloy names to their parts:

• Permalloy = Fe + Ni (magnetic)
• Stainless steel = Fe + Cr + Ni
• Brass = Cu + Zn
• Bronze = Cu + Sn
• Solder = Sn + Pb
• Duralumin = Al + Cu + Mg + Mn

Remember "Permalloy: Permeable, Ni-ce magnet" to recall that it contains nickel.