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Magnetism and Electromagnetism - Engineering

Q1:

What is the magnetomotive force in a 75-turn coil of wire when there are 4 A of current through it?

A 18.75 At

B 30 At

C 300 At

D 187 At

ANS:C - 300 At

MMF = T *A. T=75.
A=4.
So, MMF = 75 * 4 = 300AT.