nickel, copper and iron

nickel, copper and zinc

copper, nickel and antimony

iron, zinc and bismuth

nichrome

invar

magnin

elinvar

63 to 67% nickel and 30% copper

88% copper and 10% tin and rest zinc

alloy of tin, lead and cadmium

malleable iron and zinc

kind of stainless steel

none ferrous alloy

polymer

nickel and iron alloy having high permeability.

0.5% of phosphorous

1% phosphorous

2.5% phosphorous

none of the above.