Which of the following electromagnets would produce the greatest magnetomotive force?
A) A coil of wire with 1,000 turns and 10 amperes of current
B) 10,000 ampere-turns wrapped around an iron core
C) 100 turns of wire flowing 50 amps of current
D) 1 amp of current through 5,000 turns of wire

Question

Quizplus · Accepted Answer

Option B specifies 10,000 ampere-turns directly, which is the product of the number of turns and the current through them. This is the definition of magnetomotive force (MMF), and it is higher than the MMF calculated for the other options.

Which of the Following Electromagnets Would Produce the Greatest Magnetomotive