- #1
YoshiMoshi
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Homework Statement
A magnetic flux of 400 micro-webers passing through a coil of 1200 turns is reversed in 0.1 sec. Calculate the average value of the e.m.f. induced in the coil. (Hint use Faraday's Law)
Homework Equations
The Attempt at a Solution
So I know that
phi = F/R Wb
phi is flux
F is magnetomotive force MMF
R is reluctance
I also know that
F = N I
F is the MMF
N is the number of turns in the coil
I is the current in each turn
I now that faradays law is
E = - N * d[phi_B]/dt
Where E is the electromotive force (EMF)
N is the number of turns in each coil
phi_B is the magnetic flux through a single loop
Given:
phi_B = 400 micro Wb
N = 1200 turns
t = 0.1 s
solve for E
I don't see how to solve this problem. I know phi_B but not the derivative of it as a function of time. I also don't know the current. Any help would be greatly appreciated.