Question

Which would be a better Mar b)? Justify your Magnew - curve for two ferromagnetic materials is shown below. Which choice as transformer magnetic core material in netic core material in an ac system, (a) or (b)? Justify The B-H curve for two ferrom (2 marks) answer. IM B (Wim) Ok H(AVm 20 60 40 H(A.Um) (a) (b) we negle In a magnetic circuit, why can we ignore sections that have "infinite permeability" when we analyze the circuit? many more e circuit mayrohe Salvation could be ano ed and becay ury could be (2 marks) segased as mfinite (non-linear Phot beyond u= urillo baturation,

Answer 1

For the given BH curves of the two ferromagnetic materials.The better choice for transformer core is (a) than (b).

According to steinmetz hysteresis law:

area of hysteresis loop is directly proportional to B_max ^1.6.

hysteresis energy loss=n*B_max ^1.6.

hysteresis power loss=n*f*v*B_max ^1.6.

as the area of (a) hysteresis loop is less so the core loss is less and more preferable than (b).

where (b) can be used as permanent magnets as the retentivity and coercivity is more.

I hope this helps you!