Consider the experiment you did in the lab measuring the electron\'s charge-to-m
ID: 1535103 • Letter: C
Question
Consider the experiment you did in the lab measuring the electron's charge-to-mass ratio, e/m.
From the following, what can cause the radius of electrons' circular orbit to increase by two times? Choose all that are correct.
Increasing the high voltage by four times.
An increase of the e/m value by two times.
Deceasing the Helmholz coil current to half.
Increasing the Helmholtz coil current by two times.
A decrease of the e/m value to half.
(there is another chegg that says - Increasing the Helmholtz coil current by two times - is the answer. That is wrong. It may be correct, but it is more than just that one!)
Explanation / Answer
A decrease of the e/m value to half.
explanation:
The magnetic force gets balanced by the centripital force
F(m) = F(c)
q v B = m v^2/R
q B = m v/R
R = mv/Bq = v/(
we see from the above relation that the Radius directly propotional to velocity and inversely to the magnetic field and charge
In the stated options the correct one is:
A decrease of the e/m value to half.
Doing this will double the radius of the path.
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