A) A neutral oil drop is charged by removing one electron from the drop and then

Question

A) A neutral oil drop is charged by removing one electron from the drop and then the drop’s charge is measured. Another electron is then removed and the charge is measured. This is repeated three more times. What are the five expected charges on the oil drop?
B) A neutral oil drop is charged by adding electrons to the drop. The charge on the drop is measured and found to be 8.2x10^-19 C. How many extra electrons does the oil drop have? Why is this not an integer value? A) A neutral oil drop is charged by removing one electron from the drop and then the drop’s charge is measured. Another electron is then removed and the charge is measured. This is repeated three more times. What are the five expected charges on the oil drop?
B) A neutral oil drop is charged by adding electrons to the drop. The charge on the drop is measured and found to be 8.2x10^-19 C. How many extra electrons does the oil drop have? Why is this not an integer value?
B) A neutral oil drop is charged by adding electrons to the drop. The charge on the drop is measured and found to be 8.2x10^-19 C. How many extra electrons does the oil drop have? Why is this not an integer value?

Explanation / Answer

Part A

We know

Charge of electron=-1.6*10^(-19) C

So after 1st time ,charge=1.6*10^(-19)C

Second time=3.2*10^(-19) C

Third time=4 8*10^(-19)C

Fourth time=6.4*10^(-19) C

Fifth time=8*10^(-19) C

Part B

Charge of 1 electron=-1.6*10^(-19) C

No of electron=8.2/1.6=5.12

Charge is quantised so it should be an integer value .It is not an integer value as we have taken value of charge =1.6*10^(-19) C but it may not be exact 1.6*10^(-19).There might be errors in measurement too.

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