magnetic field around a wire.
When a current passes through a wire, a magnetic field is produced. A compass needle placed near the wire will turn because of the existence of the magnetic field. If the direction of the current is reversed, the direction of the needle reverses also. Ampere's right hand rule can be established from the results of this demonstration.
|Oersted's law apparatus||021-5B|
|DC power supply or battery||021-16B|
|two leads with alligator clamps||017-22B|
|Leads on side of 021-15|