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Q.

Two positive point charges $q_{1} = 16 μ C$ and $q_{2} = 4 μ C$ are separated in vacuum by a distance of 3m. The point on the line between charges where the net electric field is 0 from $q_{1}$ is ___m.

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Detailed Solution

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$r = \frac{d}{\sqrt{\frac{q_{2}}{q_{1}}} + 1}$

$r = \frac{3}{\sqrt{\frac{4}{16}} + 1} = \frac{3}{\frac{1}{2} + 1} = \frac{3}{2} \times 2 = 2 m$

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