# Homework Help: Quick question about magnets.

1. Nov 19, 2006

### LMTMAC

Hey all,

New poster here that will be back to ask and answer seeing as how well versed you all are. My current dilemma deals with a moving charge and the magnetic field it produces. (sorry if this is in the wrong area of the site)

Basically it's this:
Consider a charged particle moving with a constant velocity. Which of the following statements are true? (Give ALL correct answers: b, ac, bcd, ..., or none)

a) There is no electric field generated by the moving charge.
b) The magnitude of the magnetic field generated by the charge has nothing to do with the mass of the particle.
c) The magnitude of the magnetic field generated by the charge is inversely proportional to the speed of the particle.
d) The direction of the magnetic field generated by the charge is parallel to the velocity.
e) The magnitude of the magnetic field generated by the charge is proportional to 1/r where r is the distance from the charge.

I've narrowed it down to what I think are the right answers, d and/or e. Any insight would be greatly appreciated as my study partner and I have hit a brick wall.

Thanks.

2. Nov 21, 2006

### OlderDan

Last edited by a moderator: Apr 22, 2017