postulate 9
If two planes intersect, then their intersection is a line.
Postulate 9 is also known as the Law of Electromagnetic Induction, which states that a changing magnetic field induces an electric field, and vice versa. More specifically, it states that an electric current can be induced in a closed circuit by a changing magnetic field in that circuit or a nearby circuit.
This postulate was first proposed by Faraday in 1831. He discovered that if a magnet is moved in and out of a coil of wire, an electric current is produced in the wire. Furthermore, if the magnet is kept stationary and the coil is moved, the result is the same. This is because a changing magnetic field induces an electric field, according to the Law of Electromagnetic Induction.
This postulate has numerous applications in modern-day technology, including generators, transformers, and electric motors. It also plays a key role in the functioning of electrical power grids and the transmission of electricity.
In summary, Postulate 9 is the Law of Electromagnetic Induction, which states that a changing magnetic field induces an electric field and vice versa, and it has a wide range of practical applications in modern-day technology and electricity transmission.
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