A closed loop with the geometry shown in Fig. 3.9 is placed in a uniform magnetic field direction into the plane of the paper. If the magnetic field decreases with time, determine the direction of the induced emf in this loop.

Explanation

Therefore are two loops that are immersed in the magnetic in the field, namely. `ABEFA` and BCDEB`. ltbr. Consider loop `ABEFA`. Magnetic flux is into the plane paper. For loop `BCDEB` too, the magnetic flux is into the plane of the paper. In both loops, the magnetic flux is decreasing with time.
therefore, the induced current in loop `ABEFA`,`i_(1)`, will be in a direction so as to induced a flux tnto the paper. the direction of `i_(1)` is clockwise.
Likewise in loop `BCDEB` the current `i_(2)`, will be in a direction so as to induced a flux tnto the paper. The direction of `i_(2)` is also clockwise. The final induced current in all the arms of the loop are shown in Fig.3.10.