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Two fixed point charges +4e and +e units...

Two fixed point charges `+4e` and `+e` units are separated by a distance a. Where should a third point charge be placed for it to be in equilibrium?

A

`(2r)/(3)` from q

B

`( r )/(3)` from q

C

`( r )/(2)` from q

D

`( r )/(3)` from 4 q

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