It is made of plexiglass and could be demonstrated on projection instrument. It has wide field vision, can be gathered with variable resistance and electric current instrument.

Specifications:

Straight resistance in rectangle coil: 2Ω

Max working electrical current: 2A

Max angle of little magnet pointer: ＞30°(I=2A, R＜3cm

Range of variable resistant: 0~5Ω(2A)