Why Ignore the Magnetic Field in a Mass Spectrometer?

AI Thread Summary
In a mass spectrometer, the electric field strength is critical for the velocity selector, which is set at 2,500 V/m, while the magnetic field strength is 0.035 T. The magnetic field is not ignored; rather, it plays a role in the calculations for the deflection chamber. The confusion arises from the distinction between the velocity selector and the deflection chamber, where the magnetic field's influence is more pronounced in the latter. The calculations for the path radius of a singly charged ion with a mass of 2.18E-26 involve both electric and magnetic fields, emphasizing their importance in the overall function of the spectrometer. Understanding the specific roles of these fields clarifies their application in mass spectrometry.
darksyesider
Messages
63
Reaction score
0

Homework Statement



Consider a simple mass spectrometer. The magnitude of the electric field between the plates of the velocity selector is 2 500 V/m and the magnetic field in both the velocity selector and the deflection chamber has a magnitude of 0.035 T. Calculate the radius of the path for a singly charged ion with mass m=2.18E-26.




Homework Equations




qE=1/2 mv^2

F = qVxB

The Attempt at a Solution



Solution attached.

Why is the magnetic field ignored for the velocity selector portion??
 

Attachments

  • Screen Shot 2014-04-22 at 5.45.31 PM.png
    Screen Shot 2014-04-22 at 5.45.31 PM.png
    12.5 KB · Views: 549
Physics news on Phys.org
I don't understand what you mean by ignored as the field strength is used in both calculations.
 
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
View full post »

Similar threads

What I do not understand about mass spectrometers
Replies
28
Views
2K
Mass spectrometer problem -- Need help
Replies
3
Views
2K
How Is Current Calculated in a Mass Spectrometer?
Replies
3
Views
1K
Speed, force, magnetic flux of an ion?
Replies
13
Views
3K
Charges of ions in a mass spectrometer
Replies
1
Views
1K
Mass spectrometer - no deflection
Replies
14
Views
3K
Calculating magnetic field outside a solenoid
Replies
15
Views
1K
Mass-to-Charge Ratio of an Ion in Mass Spectrometer
Replies
1
Views
2K
Circular Motion in a Simple Mass Spectrometer
Replies
4
Views
5K
Find the equation of this magnetic field
Replies
6
Views
1K

Hot Threads

Recent Insights

Back
Top