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A closed loop with the geometry shown in...

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.

Text Solution

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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.
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