Summary
When a particle with a charge (q) moves through a magnetic field (B), it
experiences a magnetic force (FB). The direction of FB is perpendicular to
both v and B and is given by the right-hand rule.
Magnetic forces affect moving charges, and a current-carrying wire contains
charges that move. The magnetic force that affects a wire that carries a current
is represented by the equation FB = IℓB sin θ.
Magnetic forces never change the speed of a charge, they only turn it.
Magnetic forces do no work.
Magnetic fields are created by current-carrying wires because of the motion of
the electric charges that flow down a wire. The current (I) generates a
magnetic field (B) in the surrounding space that is proportional to the current
and inversely proportional to the distance from the wire (r). Use the equation
B∝.
