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Unformatted text preview: age 5. [Hint: magnetic fields add as any vector fields do.] Helmholtz coils are separated by a distance equal to their radius R. You should obtain 4 B =⎛ ⎞ ⎝ 5⎠
radius of the coils in meters. 3/2 µ0 NI NI = 9.0 × 10 −7 R R Eq. 2 where B is the magnetic field in tesla, I is the current in amps, N is the number of turns in each coil, and R is the GSI Initials: ________ Physics 7B Charge-to-mass: e/m p. 4 Important Background Information About Atoms
All normal matter is made up of atoms. Atoms have a “size” of roughly 1 Å (“Ångstrom”, 10-10 meters), and range in mass from about 10-27 kg to 10-25 kg. Atoms are in turn made up of smaller particles: positivelycharged protons, uncharged neutrons, and negatively-charged electrons. Protons and neutrons have almost the same mass (about 10-27 kg) while electrons are about 10-30 kg. Protons and electrons have equal and opposite charge, |e| = 1.6 x 10-19 C. An atom’s protons and neutrons are contained in the atom’s nucleus, which is about 1 fm (“femtometer”, or “fermi”, 10-15 meters) across—a miniscule fraction of the atom’s total size. The number of protons in an atom’s nucleus determines what kind of atom it is, where it sits on the...
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