# What is the difference b/w a magnetic field and electric field?

#### spo01

##### Member
10+ Year Member
i just can't grasp the difference. i know a change in one creates the other, but i don't really understand what this means either.

#### craniotomy30

10+ Year Member
An electric field is set up by any type of non-neutral charge. Also, the force of a electric field is parallel to the displacement of a point charge. A magnetic field is set up by a moving, non-neutral charge, like a current. The force of a magnetic field is perpendicular to velocity of the affected particle.

#### BlackSails

10+ Year Member
Constant magnetic fields also do no work.

#### NeuroChaos

10+ Year Member
An electric field causes electron (or protons) to move. It exerts a force upon those particles. So the particues move in one direction or another. Now, you know that movement of charges is also known as current. Thus electric field causes current.
This current creates a magnetic field. We know that current creates a magnetic field from the biot savert law and ampers law.
That is why when you change one the other is created. When you change E field, current is created and this current creates B field. When you change B field, you are effecting the current in some way becuase changing a current is the only way to change B field. If you are changing current, than E field is changing.
Did get you totally confused? It is kind of confusing.

OP

#### spo01

##### Member
10+ Year Member
thanks guys
i am getting the main points (which i think is probably good enough for the mcat): when to use the RHR, when work is created, etc. it's just visualizing it is the hardest. i've tried you-tube'ing it, googling for images, and am yet to find a good comparsion.

#### Character

10+ Year Member
5+ Year Member
all you need to know is that magnetic fields dont exist unless charges are moving. Electric fields exist even when charges are still.....and magnetic fields dont cause a change in velocity but causes uniformed circular motion..you should be fine with that.

##### No summer
Moderator Emeritus
10+ Year Member
5+ Year Member
Moving to Study Q&A

#### SKation

An electric field causes electron (or protons) to move. It exerts a force upon those particles. So the particues move in one direction or another. Now, you know that movement of charges is also known as current. Thus electric field causes current.
This current creates a magnetic field. We know that current creates a magnetic field from the biot savert law and ampers law.
That is why when you change one the other is created. When you change E field, current is created and this current creates B field. When you change B field, you are effecting the current in some way becuase changing a current is the only way to change B field. If you are changing current, than E field is changing.
Did get you totally confused? It is kind of confusing.
Hey,

Does a constant electric field create a magnetic field? This is the only aspect im confused on cause a still charge doesnt.

Thanks!