Question: A (+7.5 mathrm{nC}) point charge and a (-2.0 mathrm{nC}) point charge are (3.0 mathrm{~cm}) apart. What is the electric field strength at the midpoint between

A $+7.5 \mathrm{nC}$ point charge and a $-2.0 \mathrm{nC}$ point charge are $3.0 \mathrm{~cm}$ apart. What is the electric field strength at the midpoint between the two charges?

A. $3.3 \times 10^{3} \mathrm{~N} / \mathrm{C}$

B. $5.7 \times 10^{3} \mathrm{~N} / \mathrm{C}$

C. $2.2 \times 10^{5} \mathrm{~N} / \mathrm{C}$

D. $3.8 \times 10^{5} \mathrm{~N} / \mathrm{C}$

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