Q1. Which of the following metals is used in the electromagnets ?
(a) Soft iron
(b) Stainless steel
(c) Cobalt
(d) Copper
(UPSC Prelims 1979)
Answer: (a) Soft iron
Explanation: Soft iron is used in electromagnets because it has high magnetic permeability and low retentivity, allowing it to quickly gain and lose magnetism. This makes it ideal for applications where the magnetic field needs to be switched on and off rapidly.
