Physics
Electromagnetism
Page 4 of 5
#25 For diamagnetic materials, $\chi_m$ is
A) Positive and small
B) Negative and small
C) Positive and large
D) Negative and large
#26 For ferromagnetic materials, $\chi_m$ is
A) Positive and small
B) Negative and small
C) Positive and large
D) Negative and large
#27 The Curie temperature is the temperature above which
A) A ferromagnetic material becomes paramagnetic
B) A paramagnetic material becomes diamagnetic
C) A diamagnetic material becomes paramagnetic
D) A paramagnetic material becomes ferromagnetic
#28 The hysteresis loop is associated with
A) Paramagnetic materials
B) Diamagnetic materials
C) Ferromagnetic materials
D) All magnetic materials
#29 The area of the hysteresis loop represents
A) Energy loss per cycle per unit volume
B) Power loss
C) Heat loss
D) All of these
#30 The material suitable for making permanent magnets should have
A) High retentivity and high coercivity
B) High retentivity and low coercivity
C) Low retentivity and high coercivity
D) Low retentivity and low coercivity
#31 The material suitable for making electromagnets should have
A) High retentivity and high coercivity
B) High retentivity and low coercivity
C) Low retentivity and high coercivity
D) Low retentivity and low coercivity
Page 4 of 5
Register or Login for comments
Comments: