Question

Permanent magnets can be made from alloys of:

• A. zinc
• B. aluminium
• C. cobalt
• D. lead

Answer 1

The correct option is C cobalt

Ans :- Cobalt

- Alnico alloy, an iron alloy with aluminum, nickel and cobal.

- Alnico alloys make strong permanent magnets.

Cobalt based soft magnet alloys have advantages over other soft magnets in that they have a high saturation point, have a good permeability in magnetic fields and have a high Curie Point of $950-{990}^0$C resulting in magnetic properties not being altered under temperatures of ${500}^0$C.

Therefore permanent magnet made from alloy of cobalt.