If you have a changing B-field that induces an emf of magnitude of 0.1V through

Question

If you have a changing B-field that induces an emf of magnitude of 0.1V through one loop, how much emf will the same changing B-field produce if you have N loops the same size but connected in series.
1. N Volts
2. 0.1N Volts
3. 1/N Volts
4. 0.1/N Volts
5. 0.1 Volts

You move a bar-magnet towards a loop with the N-pole of the bar magnet pointing towards the loop and you observe an emf in the loop. If you repeat the motion but with the S-pole of the bar magnet pointing towards the loop, then the emf you observe (choose the correct response)
1. Is the same sign as the first observation
2. No emf will be observed
3. Is an emf of opposite sign

Explanation / Answer

Concept: (1)

As induced e.m.f in the loop is directly prorotional to Number of the turns presenting in the loop and magnetic flux (Rate of change of magnetic field ) in the loop by the mathematical formula we have ,    induced e.m.f will be         e = N d/dt where e is the induced e.m.f               N is the no. of turns in the loop                  d/dt rate of change of magnetic flux   thus, if th e loops are connected in the series ,          the ivduce e.m.f in the loop will be of    0.1 N    thus, among the given options option :    2 is correct               (2)               Acc. to lenz's law           The induced e.m.f in the loop is always                opppes the motion of it cause     thus, sign of e..m.f will be of   opposite     thus, sign of e..m.f will be of   opposite         thus,   among the given option : 3 is correct

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