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Inductors - Technical MCQs

Q1:

In a B-H curve, magnetizing force is equal to:

A mcq8_1001_1.gif

B H = I × N

C ampere-turns per weber

D webers per square meter

ANS:A - mcq8_1001_1.gif

For perfect core coil, H=no.of turns x current.
For air core L or non-magnetizing core has,
H= constant value (u0=4 x 10 power -17).

MMF for length Force(H)= NI x L.

Flux density relation with MMF(H)=(NI X L)/B.
=> for also include Length.
BH=NI.=> for only current.
BH=u0.=> for constant value.