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A point charge produces an electric fiel...

A point charge produces an electric field `2 NC^(-1)` at a point 0.5 m distant from it. Calculate the value of q.

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Data supplied, `E=2NC^(-1),` r=0.5 m
Field intensity `E=(1)/(4pi epsi_(0)) q/r^(2) therefore 2=(9 xx 10^(9) xx q)/((0.5)^(2)) therefore q=5.55 xx 10^(-11)C`
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