Solving Cathode Ray Tube Homework with Mass, Speed & Magnetic Field

AI Thread Summary
A positively charged particle with a mass of 7.2 * 10^-8 kg is moving east at 85 m/s when it enters a 0.31 T magnetic field and exits after 2.2 * 10^-3 seconds, traveling one-quarter south at the same speed. The key equations for solving the problem involve the magnetic force and centripetal force relationships, specifically Fc=Fm and Fm=qvB. To determine the charge and magnetic force, the radius of the particle's path needs to be calculated, which can be derived from the time spent in the magnetic field. The discussion highlights the need to calculate the period for a complete circular orbit to find the radius, enabling the solution for charge and magnetic force. Understanding these concepts is crucial for solving the problem effectively.
soul5
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Homework Statement


A positively charged particle of mass 7.2 * 10^-8kg is traveling east with speed of 85 m/s. The particle enters a 0.31 T uniform magnetic field, and 2.2 * 10^-3 secounds later leaves the field one-quarter south with speed of 85 m/s. What is the charge of the particle and magnetic force?


Homework Equations



Fc=Fm

mv^2/r=qvB

Fm=qvB

The Attempt at a Solution



I tried but I don't have radius and charge what do I do?
 
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I think because they give you a time here you can calculate the period for what would be a complete circular orbit, and then extrapolate the radius. From there, I think you should be able to solve it.
 
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