Let E (r), E (r) and E3(r) be the respective electric fields at a distance r...

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Let E (r), E (r) and E3(r) be the respective electric fields at a distance r from a point charge Q, an infinitely long wire with constant linear charge density 2, and an infinite plane with uniform surface charge density o. If E (r) = E (r) = E (r) at a given distance ro, then (A) Q = 4onr (C) E, (r/2) = 2E (1/2) 2 2 (D) E (r/2) = 4E3 (1/2) (B) = Let E (r), E (r) and E3(r) be the respective electric fields at a distance r from a point charge Q, an infinitely long wire with constant linear charge density 2, and an infinite plane with uniform surface charge density o. If E (r) = E (r) = E (r) at a given distance ro, then (A) Q = 4onr (C) E, (r/2) = 2E (1/2) 2 2 (D) E (r/2) = 4E3 (1/2) (B) =

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