Answer:
moving a magnet into a solenoid
moving a magnet out of a solenoid
moving a solenoid in a magnetic field
Explanation:
A conduction coil wrapped around an iron core forms a solenoid. When current is passed through the coil, it generates magnetic field. Thus, solenoid is an electromagnet.
From Faraday's law: A changing magnetic field induces electromotive force across a conduction wire placed in it.
Induced emf is the rate of change magnetic flux.
[tex]e = -\frac{d\phi}{dt} = - \frac{dB A}{dt}[/tex]
Electric current can be generated suing a solenoid. When a magnet is moved in or out of the coil, current flows in the coil. This is because, a changing magnetic field induces emf across the coil. Current can also be generated by moving the solenoid into the magnetic field.
