Demos: 6B-11 Force Between Coil and Wire
A flexible wire is suspended near a solenoid. When the solenoid is activated and a current is sent through the wire, the wire wraps itself around the solenoid. When the current in the wire is reversed, it wraps around the solenoid in the opposite direction.
Directions: The wire and the solenoid are attached to separate DC sources. First activate the solenoid circuit, then the wire circuit. A reversing switch allows the current to be reversed in the wire. Although visibility is quite good, the camera projection system may be used to provide for better viewing.
Suggestions for Presentation: We recommend that you perform Demo 6B - 10 prior to doing this one. Ask the students what differences occur in the interacting fields if one of the wires is replaced by a solenoid. Focus on the nature of the two fields where they interact.