Description

Purpose: Demonstrate the phenomenon of direct current passing through a wire to generate a magnetic field around it, and the relationship between the direction of the magnetic field and the direction of the current.

1. Rectangular s for linear current magnetic field use the vertical side of the rectangular s.

2. The toroidal current magnetic field is demonstrated with a toroidal .

3. The solenoid magnetic field uses the solenoid to demonstrate that the external circuit remains unchanged. After the power is turned on, the iron powder around the solenoid is arranged into magnetic lines according to the direction of the magnetic field, and the small magnetic needles are placed in various positions to test. The direction of the magnetic field. Changing the direction of the current and the direction of the magnetic line of induction also change its direction.The relationship is also in line with the right-hand spiral rule.The magnetic field direction of a solenoid is similar to the magnetic field of the toroidal current.