TPR Practice Test 2 (Item 20) Magnetic field produced by moving charge.

[House D.O.]

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See attachment first. (dont read passage scroll down to question)

It says according to the right hand rule but.... there is only a velocity? Or is it like a magnetic field created from a current going through a wire? Which i guess would produce , on the left side a magnetic field going in the page, on the right a magnetic field coming out. Im totally confused with this ?

 

[erythrocyte666]

The right-hand rule has some variations. In this case the moving charge is analogous to a current in a wire inducing a magnetic field around the wire, in which case you curl fingers in direction of induced B field and thumb along current.
Having said that, you should always remember that whether charge induces B field or B fields exerts force on charge, both are always perpendicular to each other. You can eliminate A and B with this, and you can still use traditional right hand rule to verify the answer

 

[House D.O.]

@erythrocyte666 Yeah thats what I was thinking also that this can be looked at like a wire. But the diagram in the answer is really not perpendicular in my perpsective which is why I got tripped up. Drawing should have been shown with dots and X's on each side I guess.

Thanks btw