[单选题]
A charge of X and a charge of 20nC are held:ua+dp-xv k) k at a fixed distan 0k cc,pb-/viqce.
A point where the electric field is zero can only be found in region 1. Which of the following statements is true about the charge on X
A. Positive and bigger than 20nC
B. Positive and smaller than 20nC
C. Negative and bigger than 20nC
D. Negative and smaller than 20nC
