Question
Physics Question on Magnetic properties of materials
The materials suitable for making electromagnets should have
A
high retentivity and high coercivity
B
low retentivity and low coercivity
C
high retentivity and low coercivity
D
low retentivity and high coercivity
Answer
high retentivity and high coercivity
Explanation
Solution
The materials suitable for making electromagnets should have-high retentivity and low coercivity. Coercivity is usually measured in oersted or ampere/meter units and is denoted HC. When the coercive field of a ferromagnet is large, the material is said to be a hard or permanent magnet.