Earth's magnetic force on a proton

AI Thread Summary
The calculation of the magnetic force on a proton using the values provided yields approximately 8e-21 Newtons, but there is uncertainty regarding the chosen magnetic field strength of 50 microtesla. Participants note that the Earth's magnetic field strength can vary significantly across different locations, which may affect the accuracy of the result. The original poster is encouraged to consider this variability when selecting values for calculations. The discussion emphasizes the importance of understanding local magnetic field conditions in physics problems. Accurate results depend on precise input values, particularly for the magnetic field strength.
Jaccobtw
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Homework Statement
A proton is flying to the east near the surface of the earth at 1000m/s. What is the magnitude of the force (in N) the proton feels due to the earth's magnetic field?
Relevant Equations
F = qvBsin##\theta##
Plug in the elementary charge for q, 1000 m/s for v, 50 microtesla for B and 90 degrees for theta and I get about 8e-21 Netwons. But apparently this is wrong, anyone know why? Thank you.
 
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Your calculation looks correct. The problem statement as given doesn't provide the strength of the B-field. The field varies quite a bit over the surface of the earth. Why did you choose 50 μT?
 
TSny said:
Your calculation looks correct. The problem statement as given doesn't provide the strength of the B-field. The field varies quite a bit over the surface of the earth. Why did you choose 50 μT?
google!
 
Jaccobtw said:
google!
Click on the "varies quite a bit" in my previous post.
 
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