-18 A flexible loop of wire is initially in the shape of a square of side length 5 cm.It is sitting in a region of uniform magnetic field of strength 3.6 T, as shown below. The loop is then rapidly deformed into a rectangle of dimensions 9 cmby 1 cm, generating an emf of 75 mV in the process. Determine the time interval over which the loop is deformed from a square to a rectangle.

Fig: 1

Fig: 2