An electron (of mass m e ), at rest, is located at one end of a long TV picture

Question

An electron (of mass me ), at rest, is located at one end of a long TV picture tube of length L . It experiences a constant horizontal force from the TV tube as it travels through the TV tube. The electron reaches the opposite end of the TV tube after a time of t . Ignore air resistance.

(a) Determine the electron’s acceleration during it’s “journey"

b) Determine the magnitude of the net force acting on the electron.

c) Calculate the numerical answers for parts (a) and (b) using the following values: L:12 cm, me=9.11*10-31 kg, t=0.12s

Explanation / Answer

(a)S =ut+1/2 at2

L=0+ 1/2 at2

a =2L/t2

(b) F =m a =me x2L/t2

(c) a =2x0.12/0.12x0.12 =16.67 m/s2

F = 9.11x10-31 x 16.67 = 151.833x10-31 N

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