- #1
MarekS
- 34
- 0
I have 2 problems with Coulumb's law:
1) contrary to a gravitational field isn't there a limit to the area of a magnetic field? How can this be calculated? F= kq1q2 / d^2 doesn't point it out.
2) same thing moving inward. Does the force grow to infity, when distances get smaller.
Also a related exercise: 2 electrons are moving toward each other at a specific speed (v) and a specific angle (a). What is the minimal distance (l) between them?
They'll move with a hyperbolic trajectory, but in my opinion contact should also be possible (necessity of sufficient speed).
My calculations:
F=kq^2 / l^2 E=mv^2/2 E=Fl*cos a
kq^2 / l^2=mv^2/2l*cos a
l=2kq^2*cos a/mv^2
When using electron's mass, charge and a is 0 (cos a=1) the answer is ruffly l=506/v^2
Of course that rules out the possibility of contact, but the flaw is already in Coulumb's equation.
Does this make any sense?
MarekS
1) contrary to a gravitational field isn't there a limit to the area of a magnetic field? How can this be calculated? F= kq1q2 / d^2 doesn't point it out.
2) same thing moving inward. Does the force grow to infity, when distances get smaller.
Also a related exercise: 2 electrons are moving toward each other at a specific speed (v) and a specific angle (a). What is the minimal distance (l) between them?
They'll move with a hyperbolic trajectory, but in my opinion contact should also be possible (necessity of sufficient speed).
My calculations:
F=kq^2 / l^2 E=mv^2/2 E=Fl*cos a
kq^2 / l^2=mv^2/2l*cos a
l=2kq^2*cos a/mv^2
When using electron's mass, charge and a is 0 (cos a=1) the answer is ruffly l=506/v^2
Of course that rules out the possibility of contact, but the flaw is already in Coulumb's equation.
Does this make any sense?
MarekS
Last edited: