M g = Q E = Q V/d
where d is the plate separation and Q is the charge.
Solve for d. You know all the other terms
6. A charged particle remains stationary in an upwardly directed E field between two parallel charged plates separated by 2 cm. Compute the potential difference V between
the plates if the particle has a mass of 4 x 10-13 kg and a charge of +2.4 x 10-18 C.
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