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rocapp
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Homework Statement
A small, 1.60-mm-diameter circular loop with R = 1.10×10−2Ω is at the center of a large 120-mm-diameter circular loop. Both loops lie in the same plane. The current in the outer loop changes from + 1A to -1A in 8.00×10^−2s .
What is the induced current in the inner loop? in nA
Homework Equations
I=ε/R
ε=Phi/t
Phi=A*B
The Attempt at a Solution
I=ε/R
Phi=(Area)*(Magnitude of field)
Phi = (PI*(8x10^-4^2 m^2)*??)
I am completely unsure of what to do after this. Please help! Thanks.