- #1
streetmeat
- 8
- 0
I have a few questions about electromagnetism that no matter how many texts i read i can't seem to figure out, so i'll cut to the chase.
1) why is current in the opposite direction of the flow of electrons? Shouldn't it be in the same direction as the electrons are travelling?
2) How does a current create a magnetic field? I know that 2 charged objects exert a force on each other so I understand how electrical forces work.. what is the difference between an electric field and a magnetic field?
3) If I'm looking at a map of an electric field.. does the tangent of a point on a field line represent the force exerted on a charge at that point? If so how can you ever know the direction a charge will travel if you have to constantly re-evaluate its acceleration? also do the lines represent equal potential energy of the charge.. so does a charge at any point on the same field line have the same amount of potential energy?
also why does electrical field obey an inverse square law to the radius, and a volt is inversely proportional to the radius. i know E = V/r so the math works out but i have trouble visualizing what this means. thanks for the help
1) why is current in the opposite direction of the flow of electrons? Shouldn't it be in the same direction as the electrons are travelling?
2) How does a current create a magnetic field? I know that 2 charged objects exert a force on each other so I understand how electrical forces work.. what is the difference between an electric field and a magnetic field?
3) If I'm looking at a map of an electric field.. does the tangent of a point on a field line represent the force exerted on a charge at that point? If so how can you ever know the direction a charge will travel if you have to constantly re-evaluate its acceleration? also do the lines represent equal potential energy of the charge.. so does a charge at any point on the same field line have the same amount of potential energy?
also why does electrical field obey an inverse square law to the radius, and a volt is inversely proportional to the radius. i know E = V/r so the math works out but i have trouble visualizing what this means. thanks for the help