Where is your attempt to do these problems? They are plug in problems.
electric field E due to charge Q is proportional to the product divided by distance^2. E field vectors add as vectors. Force on a charge is proportional to the product of the charge and E.
two point charges +30 and +11 are separated by a distance of 20cm. compute the electric intensity and the force on a +5*10^-6c charge placed midway between the charges.?
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