# Direction of magnetic force

## Homework Statement

Assuming the following directions of the charged particles velocity and magnetic field indicate the direction of the magnetic force exerted on the particle?

## The Attempt at a Solution

The force vector is perpendicular to the B field and the right hand rule states the charge is out of the page so would the vector be down?

#### Attachments

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berkeman
Mentor

## Homework Statement

Assuming the following directions of the charged particles velocity and magnetic field indicate the direction of the magnetic force exerted on the particle?

## The Attempt at a Solution

The force vector is perpendicular to the B field and the right hand rule states the charge is out of the page so would the vector be down?

Well, since the picture is posted sideways, it's hard to know what you mean by "down". What equation should you use in this problem? It's an equation that you should get very familiar and comfortable with. And does the sign of the charge make a difference in force direction?

Lorentz force law Q(E+uxB) and ya if the sign is negative it will be towards it if positive outwards

berkeman
Mentor
Lorentz force law Q(E+uxB) and ya if the sign is negative it will be towards it if positive outwards

That's the correct equation and you have the correct understanding/intuition. Does that mean you can solve the question now?

Is H analogous to B so it should be perpendicular to H field?

berkeman
Mentor
Is H analogous to B so it should be perpendicular to H field?

Yes. $$B = \mu H$$

So B and H are co-linear, and differ by the constant $$\mu$$

Ok we'll I guess it would be easier to answer this with RHR which would be out of the page right? In which case I could draw a circle with a dot in it and just write found by RHR