Magnetic Flux Lines
Representing the direction, shape, and strength of magnetic fields
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Coupled Magnetic PendulumSBU.mp4 Show Me
The
Physics
Flux Lines 4 minutes
Ex 2) Magnetic field around Straight Conductor (A Wire) with current
Image created by John Wetzel, founding author of
WikiPremed.
Magnetic field flux lines around the conductor w/ current are circular.
To find the direction of the flux lines:
a) Use north pole of a compass
b) "First Left Hand Rule"
Why Left
and not right??
1) Palms away, left hand thumb direction of electron flow (current) 2) fingers curl in direction of magnetic field
Do the magnetic lines of flux go
Compasses around a wire: top view and side view
Visualizing Magnetic Fields at Home
A bar magnet is moving beneath the paper
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Check Your Understanding
5 quick questions — pick an answer to see if you’re right.
1. What is the shape of the magnetic flux lines around a straight wire carrying current?
2. In the 1st left-hand rule for a straight wire, what does the left thumb point along?
3. Electron current flows straight up a vertical wire. Viewed from above, which way does the magnetic field circle?
4. What can you place near a current-carrying wire to find the direction of its magnetic field?
5. The direction of the current in a straight wire is reversed. What happens to its magnetic field?