Everything Hysteresis (1)

Question 1

What are hysteresis loops/curves used for?

Answer 1

To illustrate the magnetic effect or response that a changing magnetizing force has upon a particular ferromagnetic material.

plot of flux density versus magnetizing force

Question 2

Virgin Curve

Answer 2

(A - E)

Question 3

Magnetizing Force

Answer 3

(H)

Question 4

Retentivity

Answer 4

(F)

Question 5

Saturation in Opposite Direction

Answer 5

(I)

Question 6

Coercivity in Opposite Direction

Answer 6

(K)

Question 7

Flux Density

Answer 7

(B)

Question 8

Saturation Point

Answer 8

(E)

Question 9

Coercivity

Answer 9

(G)

Question 10

Retentivity in Opposite Direction

Answer 10

(J)

Question 11

Un-magnetized state

Answer 11

(O)

Question 12

Materials with a wide loop exhibit:

Answer 12

• low permeability
• high retentivity
• high coercive force
• high reluctance
• high residual magnetism

Question 13

Materials with a narrow loop exhibit:

Answer 13

• high permeability
• low retentivity
• low coercive force
• low reluctance
• low residual magnetism

Question 14

Describe the “continuous method”

Answer 14

materials with low retentivity, indications are best shown with a continuously applied magnetizing force during distribution of magnetic particles.

Question 15

Describe the “residual method”

Answer 15

Materials with high retentivity do not need a continuous magnetic field while applying magnetic particles for testing.