JEE Main · 2020 · 07 Jan 2020 · Shift 2 · Magnetic Properties of Matter

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The figure gives experimentally measured B vs H variation in a ferromagnetic material. The retentivity, coercivity and saturation, respectively, of the material are

(A) $1.0 T, 50 A / m$ and 1.5 T✓ Correct
(B) $1.5 T, 50 A / m$ and 1.0 T
(C) $150 A / m, 1.0 T$ and 1.5 T
(D) $1.5 T, 50 A / m$ and 1.0 T

Answer: (A)

Solution

Reading the hysteresis loop, the retentivity is the flux density left behind when

H

has returned to zero, which the graph shows as

1.0

T; the coercivity is the reverse field needed to drive

B

back to zero, read off as

50

A/m; and the saturation value is the greatest

B

the material attains,

1.5

JEE Main · 2020 · 07 Jan 2020 · Shift 2 · Single correct option

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