Chapter 26 Electromagnetism. Mass of Electron Determined by J.J. Thomson Determined by the deflection of the electron in a cathode ray tube.

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Presentation transcript:

Chapter 26 Electromagnetism

Mass of Electron Determined by J.J. Thomson Determined by the deflection of the electron in a cathode ray tube

Electron motion in a cathode ray tube The electron travels straight if the Electric Field (E) is balanced with the Magnetic Field (B) V = E / B – V is velocity of electron – E is electric field strength Produced by charged parallel plates – B is magnetic field strength Produced by coils perpendicular to plates

Mass Spectrometer Used to mass charged ions (Isotopes) Used to determine the charge to mass ratios as well

Electromagnetic Wave A combination of a magnetic field and an electric field – Electric Field = Produced by charges (Voltages) – Magnetic Field = Produced by Orientation of Domains of positive/negatives

Travel at 300 million m/s

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