OSCOLPHYS2015 19.1.WA.004.TUTORIAL
1. [-/1 Points]
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If an electron travels 0.280 m from an electron gun to a TV screen in 43.7 ms, what voltage was used to accelerate it? (Note that
the voltage you obtain here is lower than actually used in TVs to avoid the necessity of relativistic corrections.)
OSCOLPHYS2016 19.1.WA.005.
2. [-/1 Points]
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A bare helium nucleus has two positive charges and a mass of 6.64 \times 10^{-27} kg.
(a) Calculate its kinetic energy in joules at 3.40% of the speed of light.
(b) What is this in electron volts?
(c) What voltage would be needed to obtain this energy?
OSCOLPHYS2016 19.2.WA.019.TUTORIAL
3. [-/1 Points]
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Two parallel conducting plates are separated by a distance $d = 12.4$ cm. Plate B, which is at a higher potential, has a value of
620 V. The potential at $x = 7.50$ cm from the plate B is 46.5 V. (See diagram below.)
(a) What is the potential of plate A?
(b) What is the direction of the electric field lines between the plates?
$\circ$ toward the left
$\circ$ toward the right
$\circ$ upward
$\circ$ downward
