Eddy currents (1 Viewer)

[Demise]

They say the answer is C:

But in R, there is still generation of eddy currents meaning it should drop before the plastic ring nonetheless. The answer should be B. Eddy currents may not be as effective as Q, but still existent.

 

[freeeeee]

Yes you are correct, essentially there will be still eddy currents produced in R, however they are minimal and there will be no observable difference in this situation

 

[Demise]

Yes you are correct, essentially there will be still eddy currents produced in R, however they are minimal and there will be no observable difference in this situation

The eddy currents may not be able to rotate, but they will still be able to oppose the magnetic field, they can arguably be observed quite easily tbh. It's not as if there is no opposition whatsoever, which would mean that their answer is incorrect.

 

[Ichiii]

Plastic is an insulator. Therefore no seperation of charge and no induced current.
Copper with slit. Still induced eddy currents however the size is smaller.
So it's B

 

[Demise]

^^ My justification too. Their answer: C.

 

[someth1ng]

You justification is perfectly correct. However, BOS wants something like "smaller eddy currents will be produced and hence NO electromagnetic braking will occur". The BOS logic is not correct but that's why their answer is C - just go with it.

 

[trumvlvt]

yo in real life u will see Q and R fall at the same time. (small scale)
however more specific, answer B is more correct, eddy current complete in Q, in R there is a separate of charges that still generate weaker magenetic field.
correct answer is B
correct phenomena Q and R fall at the same time follow by P

 

[someth1ng]

yo in real life u will see Q and R fall at the same time. (small scale)
however more specific, answer B is more correct, eddy current complete in Q, in R there is a separate of charges that still generate weaker magenetic field.
correct answer is B
correct phenomena Q and R fall at the same time follow by P

This has already been answered. The "HSC answer" is C but in real life, it should be B.