Specification:
Item Type: Electromagnetic Induction Coil
Material: PVC+Brass
The outer diameter of the hole at the bottom of the original coil is: Approx. 40mm / 1.6in
The height of the round hole at the bottom of the original coil: Approx. 60mm / 2.4in
The diameter of the hole at the bottom of the secondary coil is: Approx. 25mm / 1.0in
The height of the round hole at the bottom of the secondary coil: Approx. 80mm / 3.1in

How to use:
1. Study the phenomenon of electromagnetic induction: connect the two ends of the secondary coil B to the two terminals of the ammeter with wires;
When using one end of the bar magnet to quickly insert (or withdraw) the secondary coil, the pointers of the galvanometer are all deflected, indicating that there is an induced current in the secondary coil at this time. This phenomenon is called electromagnetic induction.
2. Verify Lenz's Law
Connect the original coil to a 3-4V DC power supply, and put a single pole switch and a 109 sliding rheostat in series in the circuit. Changing the direction of current flowing into the primary coil will change the direction of induced current in the secondary coil.
Synthesize the above experimental results and analyze it to verify Lenz's law.
3. Study the phenomenon of magnetic induction

Package List:
1 x Primary Coil A
1 x Secondary Coil B
1 x Soft Iron Core C
Note:
1. Since the DC resistance of the original coil is very small, the current can not be too large, the power‑on time should not be too long, and the power supply voltage should not exceed DC4V.
2. Pay attention to protect the plastic frame, and don't let it subject to strong collision or fall on the ground.
3. After the instrument is used, it should be placed in a clean, dry and ventilated place without corrosive gas.