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Joseph Henry's work on the electromagnetic relay served as the basis for which invention?

  • Electric car

  • Electric guitar

  • Electrical Telegraph

  • Phone

Answer

The Electrical Telegraph was invented by Samuel Morse in 1837 and used Joseph Henry's work on the electromagnetic relay as the basis for its operation. The electromagnetic relay is a switch that is activated by an electrical current and is used to send signals over long distances. The telegraph used the electromagnetic relay to send electrical signals over a wire, which were then decoded at the receiving end.
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