Please help with these question. 39) Magnetizing force \"H\", is measured in: A.
ID: 2267115 • Letter: P
Question
Please help with these question.
39) Magnetizing force "H", is measured in:
A. Ampere-turns per meter.
B. Webers per square meter.
C. Ampere-turns per Weber.
D. Number of turns per square meter.
40) Magnetomotive force in an electromagnet is increase by:
A. Increasing coil turns.
B. Decreasing permenability.
C. Increasing coil length
D. decreasing the voltage.
41) Relative permeability of a magnetic material is a ratio of its:
A. Absolute permeability to that of a vacuum
B. Field intensity to its field density
C. Flux lines to its ampere-turns
D. Area its field density.
42) Reluctance varies:
A. Inversely with its length
B. Directly with its area.
C. Direcrly with its permeability.
D. Inversely with its permeability.
Explanation / Answer
39.
H=n*I
Where
n is turns,
I is currenta
Units of magnetizing force is ampere-turns per meter
Option A is correct
40.
Magnetizing force proportional to turns
So option A ia correct