A square loop with sides $12$cm by $12$cm has $25$ turns of wire and is in a magnetic field of strength $4\mathrm{.}2$x$10^-2$ T with its axis perpendicular to the direction of the field. if it is rotated in $0\mathrm{.}15$s so that its axis is parallel to the field, what is the average induced emf during this quarter turn of the loop