A mixture contains two types of particles, 40K and an unknown substance, X. 40K has a mass of 6.64x10-26 kg but the mass of substance X is not known. The charge on both substances is the same but also unknown. The particles are launched into the mass spectrometer at a speed of 6750 m/s. The mass spectrometer has a 7.47x10-3 T magnetic field pointing out of the page (as shown below). The 40K particles hit a semi-circular detector with a diameter of 25.0 cm and substance X hits the detector with a diameter of 28.0 cm Path of "K ions Velocity selector Path of substance X ions Mass Spectrometer Magnetic Field out of page

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.