e&m.jpg (12862 bytes)

PLOTTING MAGNETIC LINES OF FORCE:
A CURRENT CARRYING WIRE (Coil)

 

EQUIPMENT
    redball.gif (326 bytes) Blue Power Supply (Max = 12 volts)
    redball.gif (326 bytes) Coil Model
    redball.gif (326 bytes) Iron Filings


NARRATIVE
       The magnetic field of a current carrying wire may be plotted with iron filings.Using the Demonstration table overhead projector, connect the coil model to the blue power supply using no more than 12 VDC. Sprinkle iron filings on the model while tapping it. The filings will form circular paths around the wire. Do not leave the power supply on longer than it takes to establish the lines of force as the wire gets very hot very quickly.