ELECTRICITY AND MAGNETISM - MAGNETIC FIELDS AND FORCES - MAGNETIC FIELDS Order

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Oersted's Effect - Apparatus
# 5H10.20


Description: This apparatus demonstrates the magnetic field created by a current in a wire. The compass needle in the center of the apparatus will align itself with the net magnetic field present.

Instructions: Connect the wires from the DC power supply (or 9V battery) to the apparatus such that current either flows through the apparatus in just one direction (straight wire effect) or returns to form a loop.

With the power supply off (or battery disconnected), rotate the apparatus so that the compass needle is approximately parallel to the apparatus current carrying rods. Then turn on the power supply to deflect the compass needle.

If using a power supply, only let the current flow for 1-2 seconds, or the power supply may trip.

Parts: Oersted's effect demo, power supply

Setup Time: 10 min

Quant. in Demo Room: 1

Demo References
The Video Encyclopedia of Physics Demonstrations Disc 19-08 Hold a current carrying wire over a bar magnet on a pivot and the magnet moves perpendicular to the wire.
Hilton E-7b A compass deflects above and below a current carrying wire. ALSO- jumping wire.
Freier and Anderson Ei-8 A compass needle is used to explore the field around a long wire.

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