Question

A charge +q is located at the origin, while an identical charge is located on the...

A charge +q is located at the origin, while an identical charge is located on the x axis at x = +0.71 m. A third charge of +2q is located on the x axis at such a place that the net electrostatic force on the charge at the origin doubles, its direction remaining unchanged. Where should the third charge be located?

d=____ Number:_________ Unit:________

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Answer #1

Since the resultant force due to additional charge is in the same direction as the original force, this means that the third charge must be on the same side as the charge which is at 0.71 m from origin. We use Coulomb’s law of force between charges to find the required distance as shown below

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