Understanding Magnetic Field Direction and Force Using Right Hand Rule

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Homework Help Overview

The discussion revolves around understanding the direction of magnetic field lines and the force on a charged particle using the right-hand rule in the context of a solenoid with currents. Participants are exploring the implications of two currents and their directions on the magnetic field.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants discuss the application of the right-hand rule for determining the direction of magnetic fields created by two currents. There is confusion regarding whether the fields from the two currents cancel each other out. Questions arise about the interpretation of the problem, particularly concerning the path of a charged particle entering the solenoid.

Discussion Status

The discussion is active, with participants providing guidance on using the right-hand rule and clarifying the setup of the problem. There is acknowledgment of confusion regarding the currents and their representation in the diagram, leading to further exploration of the concepts involved.

Contextual Notes

Participants are navigating assumptions about the representation of currents in the diagram and the nature of the charged particle's path. There is a specific mention of needing clarity on which axis the particle enters and the implications of its charge.

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Homework Statement


[URL]http://ploader.net/files/795e05b46860aa55fc17ce371c14eb99.PNG[/URL]

The Attempt at a Solution


[URL]http://ploader.net/files/574a81d69c34f39fd049610251d0f0bd.GIF[/URL]

Ok so I got the first part of the question. The problem that I am having is the direction of the field lines, which direction would it be? I know I have to use the right hand rule (the curling my fingers one). I am having trouble because there are two currents in opposite direction, so how would I use it? Thanks

I am also having trouble with Part C ii). I don't understand the question.


Thanks
 
Last edited by a moderator:
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Use the thumb rule two times - one for each current
 
ashishsinghal said:
Use the thumb rule two times - one for each current

[URL]http://upload.wikimedia.org/wikipedia/commons/3/3e/Manoderecha.svg[/URL]

[URL]http://upload.wikimedia.org/wikipedia/commons/1/15/LeftHandOutline.png[/URL]

Which one? The first one, right?

But I am still having trouble with it :( There are two currents, the both are opposite, so shouldn't the fields cancel out?

Can you give me more details?

Thanks
 
Last edited by a moderator:
Yeah, the first one.
You should see for yourself if they cancel out.
BTW what are the two currents which are opposite. The figure in the question is about a single current through a solenoid. The dots and crosses should not be confused as two wires. They just show the direction of current.
 
Oh, I think I see it. I got really confused with the rule. So it should be towards the left since it is popping out below and popping into the screen above.

Answer: LEFT
Correct?
Thanks for your help :)
 
How would you do the second part?

(ii) A positively charged particle enters the solenoid along its axis. On the diagram, show the path of the particle in the solenoid.

Which axis are they talking about, the positive or negative? And what would happen?

Thanks
 
yeah, left is right. Now use hand rule for cross product to determine force.
 

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