Question

why is it necessary for a loop to be completely inside or outside the region of magnetic field for induced current

Answer 1

Answer:

The flux associated with the rectangle abcd is increasing while that with the triangle abc and loop abcd is decreasing.

To check whether the direction of current given in the options produces magnetic field opposing this change i.e. in the supposed direction, we can use the right hand grip rule.

Answer 2

Explanation:

The induced current must flow along the path bcdab so that it opposes the increasing flux. ... along cdabc, so as to oppose change in flux. Note that there are no induced current as long as the loops are completely inside or outside the region of the magnetic field.