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Ok So first I figured out the area of the loop, and then multiplied this by the B field of .7 T to get the first magnetic flux. I then took the area of the loop, multiplied by (.7+2.2T) to get the second magnetic flux, I then subtracted the first magnetic flux from the second, divided by 15 seconds to get an answer in volts so at least my units are correct, but my answer is wrong!

Area of loop: .090792 m^2

First Magnetic Flux: .063554 Wb

Second Magnetic Flux: .2633 Wb

Voltage=(.2633-.0635)/15 s=.013316 V which is wrong

What am I doing wrong?