Coil Formed By Wrapping 50 Turns

A of wire in the shape of a square is positioned in a magnetic field so that the normal to the plane of the coil makes an angle of 30.0° with the direction of the field. When the magnetic field is increased uniformly from 200 /T to 600 /T in 0.400 s, an emf of magnitude 80.0 mV is induced in the coil. What is the total length of the wire?

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