Final answer:
Attaching a coil of wire to a galvanometer and interacting with a magnet can induce electron flow and cause movement of the galvanometer needle.
Step-by-step explanation:
The subject of this question is Physics.
- A quickly disconnecting the coil causes electrons to flow because the changing magnetic field induces a current in the wire according to Faraday's law of electromagnetic induction.
- Moving a magnet in and out of the coil cancels electron flow because the changing magnetic field induces a current in one direction as the magnet enters the coil, and induces a current in the opposite direction as the magnet exits the coil, resulting in no net flow of electrons.
- Moving a magnet into the coil causes the needle of the galvanometer to move because the changing magnetic field induces a current in the wire according to Faraday's law of electromagnetic induction.
- Slowly inserting a magnet into the coil produces rapid needle movement on the meter because the gradual change in magnetic field induces a stronger current in the wire, leading to a more pronounced movement of the galvanometer needle.
Learn more about Electromagnetic induction