What is the magnitude of the uniform electric field

AI Thread Summary
The discussion centers on calculating the magnitude of a uniform electric field required to stop electrons in a particle beam with a kinetic energy of 1.40 x 10^-17 J over a distance of 13.0 cm, which was determined to be 673 N/C. Participants are seeking assistance with parts (b) and (c) of the problem, specifically how long it takes to stop the electrons and the rate of acceleration after stopping. The equations provided include work-energy principles and kinematic equations, but there are discrepancies in the answers for parts (b) and (c). Clarification and guidance are requested to resolve these calculations. The thread highlights the complexities involved in electric field dynamics and motion equations for charged particles.
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Each of the electrons in a particle beam has a kinetic energy of 1.40 10-17 J.
(a) What is the magnitude of the uniform electric field (pointing in the direction of the electrons' movement) that will stop these electrons in a distance of 13.0 cm?
correct check mark N/C

(a) was 673 N

(b) How long will it take to stop the electrons?
wrong check mark
Your answer differs from the correct answer by 10% to 100%. ns
(c) After the electrons stop, the electric field will act on them, causing the electrons to accelerate in a direction correct check mark at what rate?
wrong check mark
Your answer differs from the correct answer by orders of magnitude. m/s2 i was not able to find the answers for par b and c and help would be appreciated! thanks
 
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a : W = F d = q E d = K.E.
b : F = m a = q E && x = (1/2) a t^2
c : see above
 
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