## Find q for a moving particle

1. The problem statement, all variables and given/known data
A moving particle encounters an external electric field that decreases its kinetic energy from 8560 eV to 6770 eV as the particle moves from position A to position B. The electric potential at A is -50.5 V, and the electric potential at B is +25.9 V. Determine the charge of the particle. Include the algebraic sign (+ or −) with your answer.

2. Relevant equations
V=EPE/q, EPE=qEx=KE

3. The attempt at a solution
ΔKE/ΔV=q
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution
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 Quote by Rae_4 1. The problem statement, all variables and given/known data A moving particle encounters an external electric field that decreases its kinetic energy from 8560 eV to 6770 eV as the particle moves from position A to position B. The electric potential at A is -50.5 V, and the electric potential at B is +25.9 V. Determine the charge of the particle. Include the algebraic sign (+ or −) with your answer. 2. Relevant equations V=EPE/q, EPE=qEx=KE 3. The attempt at a solution ΔKE/ΔV=q
Hi Rae_4, Welcome to Physics Forums.

Did you have a particular question about the problem? You seem to be on the right track with your attempt.
 Yeah. I'm trying that formula, but it keeps telling me my answer is incorrect. I'm not sure what I'm doing wrong. When I attempt the practice version it is trying to tell me the answer is times 10^-18 and nothing I have in that formula would give me a number that small. Are my formulas incorrect?

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## Find q for a moving particle

 Quote by Rae_4 nothing I have in that formula would give me a number that small. Are my formulas incorrect?
The energy is given in eV. The charge of an electron is 1.6021765 × 10 −19 coulomb. That's pretty small.
 Figured it out. Thanks!

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