Finding magnitude of a particle

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Homework Help Overview

The discussion revolves around calculating the magnetic force on a charged dust particle moving through a magnetic field. The context involves a magnetic field of 0.90 T and a negatively charged particle moving at a specified velocity.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the application of the formula f=qvb and question the correctness of their calculations. There is a focus on identifying potential mistakes in the application of the right-hand rule for determining direction.

Discussion Status

Some participants have expressed uncertainty about their calculations and the direction of the magnetic force. One participant has indicated they resolved their question, but no explicit consensus or final solution has been established in the discussion.

Contextual Notes

There appears to be confusion regarding the application of the right-hand rule and the interpretation of the magnetic force direction, particularly given the negative charge of the particle.

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Homework Statement


A magnet produces a 0.90 T field between its poles, directed to the east. A dust particle with charge q = -1.0 10-18 C is moving straight down at 0.70 cm/s in this field. What is the magnitude and direction of the magnetic force on the dust particle?


Homework Equations



f=qvb

The Attempt at a Solution


(1.0e-18)(.007)(.90)=-6.3e-21 which is wrong

I followed the same format as someone else and my answer is wrong. can you help point out what the mistake is? thanks.
 
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sweetipie2216 said:

Homework Statement


A magnet produces a 0.90 T field between its poles, directed to the east. A dust particle with charge q = -1.0 10-18 C is moving straight down at 0.70 cm/s in this field. What is the magnitude and direction of the magnetic force on the dust particle?


Homework Equations



f=qvb

The Attempt at a Solution


(1.0e-18)(.007)(.90)=-6.3e-21 which is wrong

I followed the same format as someone else and my answer is wrong. can you help point out what the mistake is? thanks.



Your magnitude looks correct. What direction did you get via the right-hand rule?
 
my direction is north
 
never mind i figured out the answer. thanks for your help
 

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