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Question: Physics students often measure the ratio of the charge e of an electron to its mass m. In one experiment to measure e/m, electrons are boiled off a hot filament and accelerated through 150V (See Fig.).
a. What kinetic energy do the electrons acquire as a result? Give your answer both in joules and in electron volts.
b. After they have passed through a potential difference of 150V, what is the speed of the electrons?
c. The electrons enter a uniform magnetic field of 0.5mT traveling at right angles to the field as shown in Fig. What force will the magnetic field exert on them? Give both the magnitude and direction of the force.
d. What will be the electrons' radius of curvature in the magnetic field?
Fig. - A beam of electrons accelerates through 150V and then enters a uniform magnetic field of 0.5mT pointing into the plane of the paper
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