if a magnet is moved in and out of a coil of a copper wire, electrcity begins to flow through the coil. True or False
If the coil is in a closed circuit then electricity will flow, if not there will be only an induced emf.
True.
When a magnet is moved in and out of a coil of copper wire, it causes a change in the magnetic field within the coil. According to Faraday's law of electromagnetic induction, this change in the magnetic field induces an electromotive force (emf) in the coil.
If the coil is part of a closed circuit, meaning it is connected to form a complete loop, the induced emf will drive an electric current to flow in the circuit. This is because the emf creates an electric potential difference across the circuit, which causes the free electrons in the copper wire to move, generating an electric current.
On the other hand, if the coil is not part of a closed circuit, there will be only an induced emf, but no flow of electricity. In this case, the induced emf can be measured, but it does not result in the movement of charge or the generation of an electric current.
Therefore, if the coil is in a closed circuit, electricity will flow through the coil when a magnet is moved in and out. Otherwise, only an induced emf will be present.