Dimensions and weight Base: 180 mm (length) x 130 mm (width) x 310 mm (total height) Single magnet: 85 mm (length) x 18 mm (width) x 15 mm (height) Weight: 1400 g How to use Install the instrument as shown in the figure Prepare one student power supply (or 4 dry batteries), one singlepole switch, one 10 to 20 ohm sliding rheostat, and several wires Connect the components to form a series circuit through the terminal and wire frame Uses Designed for middle school physics teaching to demonstrate the relationship among the direction of the ampere force, its magnitude (F), current intensity (I), the length of the conducting wire (L), and the magnetic induction intensity (B) The relationship is described by F I B L Demonstrates how the direction and magnitude of the ampere force depend on current strength, wire length, and magnetic induction Practical use scenarios Classroom demonstration of F I B L: students adjust the current with the sliding rheostat and observe changes in the force on the conductor within the magnetic field Laboratory activity to compare effects of wire length: keep I and B constant while varying L to see how force scales with length Magnetic induction variation exercise: explore how changes in B (via magnet position or different magnets) affect the force for fixed I and L, illustrating F B