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A proton is traveling horizontally to the right at 4.90×106 m/s . Find (a)the magnitude and...

A proton is traveling horizontally to the right at 4.90×106 m/s .

Find (a)the magnitude and (b) direction of the weakest electric field that can bring the proton uniformly to rest over a distance of 3.50 cm .

How much time does it take the proton to stop after entering the field?

What minimum field ((a)magnitude and (b)direction) would be needed to stop an electron under the conditions of part (a)?

θ =

??

 ∘ counterclockwise from the left direction
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The electric field to stop proton and electron

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