The figure shows certain wire segments joined together to form a coplanar loop. The loop…

The figure shows certain wire segments joined together to form a coplanar loop. The loop is placed in a perpendicular magnetic field in the direction going into the plane of the figure. The magnitude of
\[\left.\begin{array}{ll} \times & \times \\ \times & \times \\ \times & \times \\ \times & \times \\ \times & \times \end{array}\left|\begin{array}{lll} \times & \times & \times \end{array}\right| \begin{array}{|lll|} \times & \times & \times \\ \times & \times & b_{k} \end{array} \right\rvert\, \begin{array}{ccc} \times & \times & \times \\ \times & \times & \times \\ \times & \times \\ \times & \times \end{array}\]
the field increases with time. I₁ and I₂ are the currents in the segments ab and cd. Then,