Three Charges, Each of Q = 3

Multiple Choice

Three charges, each of Q = 3.2 *10^-19 C, are arranged at three of the corners of a 20-nm square as shown. The magnitude of the electric field at D, the fourth corner of the square, is approximately

A) 1.4 * 10⁷ N/C
B) 1.0 * 10¹¹ N/C
C) 3.6 *10¹⁰ N/C
D) 30 N/C
E) 1.8* 10⁷ N/C