Dwhat should be magnitude for charge q in following configuration to make electric field at center (o) of circle to be zero? (radius r) 45 r x density (b) (a) 2

dWhat should be magnitude for charge Q in folloWing configuration to make electric field at center (O) of circle to be zero? (Radius R) 45 R X density (B) (A) 2g D) C)3q