The current, 2019, women's world record for the 400-meter run around an oval track is held by Marita Koch, with a time of 47.60
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Answer:
,
Explanation:
The force experienced by the ion due to the magnetic field is given by:
where
q is the charge
v is the speed
B is the intensity of the magnetic field
The cetripetal force is
where
m is the mass
r is the radius of the circle
Since the magnetic force acts as centripetal force, we can equate the two expressions:
Re-arranging it, we find the radius:
Now, if we want to find the time it takes for the ion to make one complete circle (=the period), we just need to divide the length of one circumference by the speed:
And susbstituting the expression we found before for r, we find