Magnetic Fields Produced by Currents

1
Magnetic Fields Produced by Currents

• February 14, 2007

2
Moving Charges Produce Magnetic Fields

• moving charges current

Right hand rule for currents (RHR-2) Thumb in
direction of current, fingers curl in direction
of B-field.
3
Example Two Wires (opposite directions)
r
4
Example Two Wires (same direction)
r
5
Loop of Wire (N1 turn)
RHR-2 Thumb along current I Fingers curl along B
B
Loop with N Turns
6
Adding Loops of Wire (same radius)
Loop with N Turns
X 1
X 2
X 3
X 4
7
The Solenoid
L
B
I
I
Similar (but not exactly the same) to adding N
turns of wire with equal radius
But lets just call
B-field through solenoid