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physics fields and charges

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I'm stumped:

2 charges, Q1 and Q2, equal magnitude, but different signs (not assigned) lie on a line, x axis, a known distance apart.

Segment pq lies centrally on the line, distance apart is known.

An electron is released at p from rest, and passes q at a given time later. The field at pq is constant.

My job is to find the size and sign of Q1 and Q2 on this info.

I believe i can calculate the electrical force on the electron, but where next? Thanks

  • physics fields and charges -

    I don't understand how the field is constant along pq. I am certain the force will vary with position.

  • physics fields and charges -

    Sorry, the field is said to be constant around the central segment pq, which is only 10 cm long.

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