Hi,
I have a question regarding CH8 Passage 1 Qs 4, as mentioned in the title:
4) Suppose the original oil droplet were replaced with a positively charged one that had twice the charge and three times the mass of the original droplet. How would the magnitude of the electric field have to be changed in order for the drop to remain suspended?
A. No change is necessary.
B. It must be increased by a factor of 2/3
C. It must be decreased by a factor of 2/3
D. It must be increased by a factor of 3/2
Note: The charge was initially negative and was able to be suspended in the Millikan oil drop apparatus with a positive plate on top, and a negative plate on bottom.
I get how to arrive with D if we were to ignore the change in charge as the BR answer key has suggested, but what I'm wondering is, if the drop is now positively charged, doesn't that mean that the oil will drop regardless of change in magnitude of the electric field? Perhaps I'm missing something here or my reasoning is off. Any help or correction is greatly appreciated.
I have a question regarding CH8 Passage 1 Qs 4, as mentioned in the title:
4) Suppose the original oil droplet were replaced with a positively charged one that had twice the charge and three times the mass of the original droplet. How would the magnitude of the electric field have to be changed in order for the drop to remain suspended?
A. No change is necessary.
B. It must be increased by a factor of 2/3
C. It must be decreased by a factor of 2/3
D. It must be increased by a factor of 3/2
Note: The charge was initially negative and was able to be suspended in the Millikan oil drop apparatus with a positive plate on top, and a negative plate on bottom.
I get how to arrive with D if we were to ignore the change in charge as the BR answer key has suggested, but what I'm wondering is, if the drop is now positively charged, doesn't that mean that the oil will drop regardless of change in magnitude of the electric field? Perhaps I'm missing something here or my reasoning is off. Any help or correction is greatly appreciated.
