(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A proton travelling along the x-axis is slowed by a uniform electric field E. At x = 20 cm, the proton has a speed of 3.5 x 106 ms-1 and at x = 80 cm, its speed is zero. Find the magnitude and direction of electric field intensity.

Can someone please!!!! check my procedure and if your really nice/helpful my answer-----thanks.

2. Relevant equations

W=Fx

W=Eqx

W=ΔK_E

ΔK_E=1/2 mv^2-1/2 mu^2

3. The attempt at a solution

1st i found the change in energy (work) to slow the proton to a stop. then thats equal to Eqx. I found E to be1.06*10^5 N/C(positive direction) please check my answer if you have time - its worth marks.

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# Homework Help: Finding Electric Field intensity

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