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Two point charge q(A) = 3 muC and q(B) =...

Two point charge `q_(A) = 3 muC` and `q_(B) = -3 muC` are located 20 cm apart in vacuum. (a) What is the electric field at the mid point O of the line AB, joining the two charges. (b) If a negative test charge of magnitude `1.5 xx 10^(-9)C` is placed at this point. What is the force experienced by the test charge?

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