# Electric charge and fields: uniform electric field

by Dx
Tags: charge, electric, field, fields, uniform
 P: n/a A force of 6N acts on a charge of 3 microC when placed in a uniform electric field. what is the magnitude of the electric field? I have E = k(Q/r^2... k=9x10^9 * (Q,charge=3x10^-9) / (?)^2 ths can't be the right formula caus e wheres r^2? Dx [?]
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PF Gold
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 Originally posted by Dx A force of 6N acts on a charge of 3 microC when placed in a uniform electric field. what is the magnitude of the electric field? I have E = k(Q/r^2... k=9x10^9 * (Q,charge=3x10^-9) / (?)^2 ths can't be the right formula caus e wheres r^2? Dx [?]
You're right, it is not the correct formula. The formula you quoted is only for an electric field due to a point charge. That's not what you have here; you have a uniform electric field.

The relationship between force and electric field is F=qE.

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