Calculate Emf in a magnetic field

[GRAvit__]

Homework Statement

Calculate the EMF induced in a 5.0 cm by 2.5 cm rectancular coil containing 150 loops if it rotates at 28 Hz in a 0.014 T magnetic field

Homework Equations

Φ=BA
ε=-N ΔΦ/Δt

The Attempt at a Solution

Φ=BA
=.05m x .025m =1.25 x 10^-3

ε=-N ΔΦ/Δt
=150 x (1.25x10^-3) / (1/28)? ----> i think this is where my problem is with HzThanks for the help :)

 

[technician]

N is 150 and you have used 250 in your equation

 

[GRAvit__]

Oh ooops thanks ok i'll change that but still don't get the right answer