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4.14×10^-5 T that points straight down, toward the earth. a)Determine the magnetic flux through the wall if the wall faces north. b)calculate the flux that passes through the floor.

a)

flux=BAcos(theta)

=(4.14*10^-5)(50 m^2)(cos 90 deg)

=0 Wb

b)

flux=BAcos(theta)

=(2.58*10^-5)(200 m^2)(cos 0 deg)

=5.16*10^-3 Wb

I'm not sure what I did wrong.