Do I use the right hand rule to figure this out? a proton traveling due east in

Question

Do I use the right hand rule to figure this out? a proton traveling due east in a region that contains only amag field experiences a vertically upward force away from thesurface of the earth. what is the direction of the mag field? a)east     b)west  c)south    d)north      e)down I think it's north but I'm not sure. Can you explain how youfigured your answer out. Do I use the right hand rule to figure this out? a proton traveling due east in a region that contains only amag field experiences a vertically upward force away from thesurface of the earth. what is the direction of the mag field? a)east     b)west  c)south    d)north      e)down I think it's north but I'm not sure. Can you explain how youfigured your answer out.

Explanation / Answer

So the general Lorentz force: F = q(v X B) here q is positive for aproton So the force is upwards, the velocity is east, thus the B isnorthwards. You align your thumb with F in the vertical upward direction, andyour palm eastwards in the velocity's direction. Note that when youcurl your fingers your fingers curl Northwards, this is effectivelyvXB, and this produces a force that is vertically upwards so itworks.

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