Electromagnetics

The year __ is noted for the development of the first electric battery by _______, and __ was a banner year for discoveries about how electric currents induce magnetism.

• 1785 Charles-Augustin de Coulomb, 1800

• 1905 Albert Einstein, 1921

• 1800, Alessandro Volta, 1820

• 1835, Carl Friedrich Gauss, 1888

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who developed one of the earliest electromagnets and dc (direct current) electric motors?

• Pieter van Musschenbroek

• Joseph Henry

• Georg Simon Ohm

• Nikola Tesla

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X-rays, another member of the EM family, were discovered in __, by _______

• 1895, Wilhelm Röntgen.

• 1905, Albert Einstein

• 1835, Carl Friedrich Gauss

• 1820, Jean-Baptiste Biot

Despite the advances made in the 19th century in our understanding of electricity and magnetism and how to put them to practical use, it was not until 1897 that the fundamental carrier of electric charge, the electron, was identified and its properties quantified by _________.

• Wilhelm Röntgen.

• Joseph Thomson

• Heinrich Hertz

• Greeks

The ability to eject electrons from a material by shining electromagnetic energy, such as light, on it is known as the ____________

• photodegradation effect.

• photosensitization effect.

• photolysis effect.

• photoelectric effect.

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______ discovers that electric charges are of two forms, and that like charges repel and unlike charges attract.

• [1752]

  Benjamin Franklin (American)

• [1800]

  Alessandro Volta (Italian)

• [1733]

  Charles-François du Fay (French)

_________ invents the Leyden jar, the first electrical capacitor.

• [1745]

  Pieter van Musschenbroek (Dutch)

• [1831]

  Michael Faraday (English)

• [1873]

  James Clerk Maxwell (Scottish)

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_______ demonstrates that the electrical force between charges is proportional to the inverse of the square of the distance between them.

• [1905]

  Albert Einstein (German-American)

• [1897]

  Joseph John Thomson (English)

• [1785]

  Charles-Augustin de Coulomb (French)

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_______ formulates Ohm's law relating electric potential to current and resistance.

• [1825]

  Georg Simon Ohm (German)

• [1826]

  Georg Simon Ohm (German)

• [1827]

  Georg Simon Ohm (German)

______ introduces the concept of inductance, and builds one of the earliest electric motors. He also assisted Samual Morse in the development of the telegraph.

• [1895]

  Wilhelm Röntgen (German)

• [1835]

  Carl Friedrich Gauss (German)

• [1827]

  Joseph Henry (American)

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