A coil formed by wrapping 50 turns 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°   with the direction of the field. When the magnetic field is increased uniformly  from 200µT  to 600µ T  in 0.4 s, an emf of magnitude 80.0 V  is induced in the coil, the total length of the wire is  $\left(270+\mathrm{x}\right)\mathrm{m},\text{\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}}\mathrm{then}\text{\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}}\mathrm{x}=?$