Magnetic Field and negative charge

[umdnjmed]

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Quick question; When determining the direction of the magnetic force acting on a moving negative charge, your thumb should be directed in the direction opposite the charge's velocity. should the the thumb's direction also be switched when determining the direction of the magnetic field due to a negative charge?

 

[Raiden2012]

Could you please explain your question? Do you mean positive charge in your last sentence? Because it seems like you're asking the same question. (what should the thumb direction be for negative charge)

 

[milski]

Yes.

 

[umdnjmed]

the first part mentioned magnetic forces while the question was about magnetic fields.

 

[umdnjmed]

thanks milski

 

[milski]

thanks milski

The field is just a way to describe what the force is at any given point. If you are doing some manipulation for the force, you'll have to do it for the related field and vice versa.

 

[ThirdEye]

Just in case you're still not clear:

Thumb always points from positive to negative and nothing else gets changed.

If you're given a negative charge, you change the direction but don't change B or F