State and explain Faraday's law.
An electromagnet is a magnet created by an electric current. The magnetic field can be adjusted by controlling the electric currents. One example is an iron core solenoid, which is a long coil of wire wound in the shape of a helix.
Answer and Explanation:
Faraday's law states that the average emf E induced in a coil of N loop is
Here, dQ is the amount of magnetic flux change per each loop and dt is the corresponding time interval.
The magnetic flux is the product of the magnetic field strength and the surface area perpendicular to the magnetic field. The unit of induced emf is volt(V). Faraday's law describes well how a voltage can be produced by various methods. You can obtain the desired voltage by changing the strength of the given magnetic field, or adjust the position of the coil/magnet and so on.
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from High School Physics: Help and ReviewChapter 13 / Lesson 10