What will be the value of point charge producing a power field of 2 newton / coulomb value at a distance of 30 cm?
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E = k*Q/r^2
where k = 9*10^9
Q = E * r^2/k
Q = 2*900*10^-4/9*10^9
Q = 2 * 10^-2-9
Q = 2*10^-11 C
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