Calculating Momentum & Angular Momentum in a Magnetic Field

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Homework Help Overview

The discussion revolves around calculating momentum and angular momentum for a charged particle moving in a magnetic field. The problem involves understanding the relationships between linear momentum, angular momentum, charge, magnetic field strength, and radius of the circular path.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • The original poster attempts to use the relationship between radius, momentum, charge, and magnetic field to find momentum and angular momentum. Some participants question how to derive angular momentum without knowing mass or velocity independently.

Discussion Status

The discussion is ongoing, with participants exploring different aspects of the problem. Some have provided equations related to angular momentum, while others express uncertainty about the calculations involved.

Contextual Notes

There appears to be confusion regarding the use of variables and the relationships between them, particularly in the context of the given equations and the information provided. The original poster has noted a lack of independent values for mass and velocity, which complicates the calculations.

eku_girl83
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Here's my problem:

A particle with charge 4.5E-19 C travels in a circular orbit with radius .465 m due to the force exerted on it by a magnetic field with magnitude 1.7 T and perpendicular to the orbit.

a) What is the magnitude of the momentum p of the particle?
I used the equation R=(mv)/(qB) and calculated mv (linear momentum) to be 3.6E-19 kg*m/s.

b) What is the magnitude of the angular momentum L of the particle?
Herein lies the rub! Angular momentum = v/R = qB/m
I don't know velocity or mass independently, only their product (mv). So how do I calculate angular momentum?

Thanks for any help!
 
Physics news on Phys.org
Double-posting is annoying.
 
Angular momentum of a particle moving in a circular motion about the centre is : mvr = pR
 
a) Only God knows

b) The hell would I know
 

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