Two bar magnets A and B are released simultaneously from the same height with th

Question

1. Two bar magnets A and B are released simultaneously from the same height with their south poles pointing toward the ground. Magnet A is simply dropped through the air, while magnet B passes through a coil of wire with many turns during its fall.
2. 
   

1. Which of the following statements are true? (Give ALL correct answers, i.e., B, AC, BCD...)
2. 
   
   1. A) The induced current flips direction as magnet B falls through the wire.
   2. 
      
   3. B) Magnet A creates a circling electric field as it falls.
   4. 
      
   5. C) Magnet B does not create any electric field as it falls.
   6. 
      
   7. D) An induced current in the wire creates a magnetic field that pushes magnet B toward the ground.
   8. 
      
   9. E) Magnet B induces an EMF in the coiled wire as it falls through it.
   10. 
       
   11. F) Magnet A arrives on the ground before magnet B.

Explanation / Answer

When magnet B falls through the coil of wire, it induces a current in the wire, the circular current induces a magnetic field that opposes the magnetic field produced by the magnet B. The magnet B experices this opposing magnetic field as a force hindering its downward motion. So, magnet B falls slower compared to magnet A.

So, the correct options are :

E) Magnet B induces an EMF in the coiled wire as it falls through it.
F) Magnet A arrives on the ground before magnet B.

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