A square loop of side $10.0\ \text{cm}$ moves at a steady $2.0\ \text{cm/s}$ towards a strip of uniform magnetic field that is $4.0\ \text{cm}$ wide, as in the figure. Its leading side is parallel to the edge of the strip, and the field is perpendicular to the plane of the loop. The loop passes completely through the strip. For how long, between the instant its leading side reaches the strip and the instant its rear side leaves it, is there an induced current in the loop?

Fig. 1: Top view of a vertical strip of uniform magnetic field coming out of the page, shown by dots, 4.0 cm wide. A square loop of side 10.0 cm lies in the plane of the page to the left of the strip and moves to the right at a steady speed of 2.0 cm per second, with its leading side parallel to the edge of the strip. An arrow marks its velocity. The side of the loop and the width of the strip are marked.