Question

According to Faraday's Law when will the measured emf induced in the coil be positive? When will it be negative? (Refer to Figure 2 and use + and - signs as appropriate) When the south pole of the magnet moves part way into the coil to the left _____ The magnet is part way into the coil and its south pole is pulled out to the right _____ When the north pole of the magnet moves part way into the coil to the left _____ The magnet is part way in the coil and its north pole is pulled out to the right _____

Answer 1

if the north pole moves towards the coil the flux in the coil will increase , to oppose this change the emf produced in the coil will be in the opposite direction i.e negative

Similarly if the north pole moves away from the coil , the flux in the coil decreases , to oppose this change the emf produced will be in the opposite direction i.e positive

if the south pole moves towards the coil the flux in the coil will decreases , to oppose this change the emf produced in the coil will be in the opposite direction i.e positive

Similarly if the south pole moves away from the coil , the flux in the coil increase , to oppose this change the emf produced will be in the opposite direction i.e negative