According to Faraday’s Law when will the measured emf induced in the coil be pos
ID: 1648960 • Letter: A
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)
1. When the south pole of the magnet moves part way into the coil to the left
2. The magnet is part way into the coil and its south pole is pulled out to the right
3. When the north pole of the magnet moves part way into the coil to the left
4. The magnet is part way in the coil and its north pole is pulled out to the right
2. The magnet is part way into the coil and its south pole is pulled out to the right
3. When the north pole of the magnet moves part way into the coil to the left
4. The magnet is part way in the coil and its north pole is pulled out to the right
Variation of Flux Passing though a Coil in the Vicinity of a Rod Shaped Magnet: The drection of the magnetic flux lines associated with a cylindrical magnet are shown in Figure 2 and the area vector associated with the coil is shown in Figure 3. By convention if the coil's area vector and the flux line direction are in the same direction, the flux passing through the coil is positive. If the flux line direction and the A vector direction are opposite, then the flux passing through the coil is negative. Figure 3: The coil in the movie is wired so its area Figure 2: External flux lines point away from a north pole and toward a south pole. vector points to the right Physics with Video Analysis 32-1Explanation / Answer
According to lenz law,current induced in coil is such that it opposes the change through it.Thus if north pole moves towards coil it will create north pole in opposite direction to repel north pole of magnet and when north pole is pulled out then it creates south pole in that direction to attract magnet.
Actually your question is not clear as you have not provided what magnet direction remains when south pole moves towards magnet .
by the way you can do question using the concept I have above mentioned.