Induced EMF Question

1. The problem statement, all variables and given/known data
A rectangular wire loop, 24mm by 36mm, is placed in a magnetic field. The flux density perpendicular to the loop is decreasing in magnitude at a rate of 0.2Wb/[itex]m^{2}[/itex]/s. Calculate the induced emf around the loop.

2. Relevant equations
The problem is I don’t know which equation applies to this question. I know that 0.2Wb/[itex]m^{2}[/itex]/s = [itex]\frac{d\phi}{dt}[/itex] but as far as I was concerned from what I have read so far is that you would need to know the number of loops to get the answer to this question.

3. The attempt at a solution
I know that the answer is 0.17mV. I managed to get this answer by multiplying the dimensions together 24mm x 36mm = 8.64x[itex]10^{-4}[/itex] then multiply this by 0.2. But I don’t understand why this this is the method, if someone could explain this for me I would greatly appreciate it :biggrin:

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