A particle with a charge of 4.0 "mu"C has a mass of 5.0 x 10^-3 kg. What electric field directed upward will exactly balance the weight of the particle?

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You need to use the following equation that helps you to evaluate the balancing force of electric field, such that:

`F = q*E => E = F/q`

Since the problem provides the mass `m = 5*10^(-3)Kg` of particle, you should replace `m*g` for `F` , such that:

`E = (5*10^(-3)Kg*9.8(m/s^2))/(4*10^(-6)C)`

`E = 12.25*10^3 N/C`

**Hence, evaluating the directed up electric field, under the given conditions, yields **`E = 12.25*10^3 N/C.`

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