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Calculate the electric field strength at distance of 3 m from a charge of 32n C placed in air.

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Given `q = +32 nC = 32 xx 10^(-6)C, r = 3 m`
`E = (1)/(4piin_(0))(q)/(q^(2)) = 9 xx 10^(9) xx (32 xx 10^(-9))/((3)^(2)) = 30 NC^(-1)`.

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