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  • Electromotive force, also called emf is measured in volts
  • It is the voltage developed by any source of electrical energy such as a battery or dynamo.
  • The word "force" in this case is not used to mean mechanical force, measured in newtons, but a potential, or energy per unit of charge, measured in volts.
  • In physics, the electromagnetic force is an influence that affects electrically charged particles. Along with gravity, it is the force that humans encounter most on an everyday basis, and it explains most of the phenomena with which people are familiar. It is responsible for electricity, magnetism, and light; it holds electrons and protons together in atoms; and it allows atoms to bond together to form molecules and drives chemical reactions. This force is also responsible for the solidity of solid objects and is the reason they cannot pass through one another.
  • The electromagnetic force is one of the four fundamental forces of nature. The other three are the gravitational force, the strong nuclear force, and the weak nuclear force. The strong nuclear force is the strongest of these, but it operates only over an extremely short range.
  • The electromagnetic force is the second strongest and, like gravity, operates over unlimited distances.
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