Two point charges q(A)= 3mu C and q(B) =...

Two point charges `q_(A)= 3mu C and q_(B) = - 3muC` are located 20cm apart in vacuum. What is the electric field at the mid point of the line joining the two charges.

`54 xx 10^(6)N//C` along OA

`5.4 xx 10^(6) N//C` along OB

`5.4 xx 10^(-6) N//C` along OB

`54 xx 10^(-6)N//C` along OB

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