Let $$E_1 (r), E_2 (r)$$ and $$E_3 (r)$$ be the respective electric fields at a distance r from a point charge Q, an infinitely long wire with constant linear charge density $$\lambda$$, and an infinite plane with uniform surface charge density $$\sigma$$. If $$E_1 (r_0) = E_2 (r_0) = E_3 (r_0)$$ at a given distance $$r_0$$, then
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