How to find the potential difference between plates?

Question

If a proton travels between two oppositely charged plates (that start from rest). And the proton hits the negative plate at a speed of 3.8 x 104 m/s. How would you find the potential difference between the plates?

Answer 1

The potential between the plates times the charge on the proton is equal to the kinetic energy gained by the proton. Therefore

.5*m*v^2 = V*q, or V = .5*m*v^2 / q

m = proton mass
q = proton charge
v = change in proton velocity

Answer 2

Draw a real angled triangle. tension electric powered = Fel to the ideal (say) = E q = V q /d tension weight rapidly down = mg draw in the hypoteneuse to represent the stress T perspective of string to horizontal = seventy six deg tan seventy six = mg/Fel = m g d / Vq so V = m g d / ( q x tan76) = 377 Volts With 3 forces in equilibrium, triangles continually seems the least perplexing thank you to bypass, exceptionally if there's a ninety degree triangle.

Answer 3

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