As an ionized particle passes through a magnetic field, how will the kinetic ene
ID: 1788537 • Letter: A
Question
As an ionized particle passes through a magnetic field, how will the kinetic energy of the particle be affected?A. Its kinetic energy will decrease as it passes through the field B. Its kinetic energy will change depending on the charge of the particle C. Its kinetic energy will increase as it passes through the field Passage II The surgical removal of cancer is a step taken prior to radiation therapy and chemotherapy in order to reduce the mass of a tumor. However, knowing the boundary line between cancerous tissue and healthy normal tissue is a constant battle, too much and a surgeon risks injury to perfectly healthy tissue, too little and the surgeon leaves behind cancerous cells. One technique to differentiate between cancerous and normal tissue is to run various samples through a mass spectrometer. The operation of the mass spectrometer relies on the fact that the path of a moving charge is effected by the presence of electric and magnetic fields. Chemists have discovered that ratios of certain lipids from cell membranes can uniquely identify various biological tissues, including tumors. A library of various lipid spectrometer signatures can be gathered and referenced to determine if a tissue has cancer cells or not, but such techniques require special preparation as spectroscopy requires ionized particles for analysis. Chemists recently have found however, that the smoke produced from electrosurgical knives happens to be comprised of the exact type of ionized particles needed for mass spectrometry These ionized particles move through the spectrometer past a magnetic field, and depending on the charge of the particles, and the direction of the field, this magnetic field would cause a semi-
Explanation / Answer
When a charged particle passes through a magnetic field, it experiences a magnetic force (QVB). This force acts perpendicular to the magnetic field and hence does not change the speed of the particle. When force is perpendicular to velocity, the further path becomes circular.
Hence, no speed has changed, kinetic energy will also remain same.
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