A Point Charge Q = 7

A point charge Q = 7.00 × 10^-9 C is placed at the origin of an xy-coordinate system. What is the electric field intensity E at a distance of x = 30 cm from this charge? (Use k = 9 × 10⁹ Nm²/C².)

A) 100 N/C
B) 400 N/C
C) 500 N/C
D) 600 N/C
E) 700 N/C