1 . Two charges Q1 = 1.4 UC and Q2 = -7.3 JC are on the x-axis as shown below. Calculate the net electric field at points a, b, and c. 15 cm 15 cm X Q2 01 b SOLUTION : Q1=1.4 x 10-6 Q2 = -7.3 x 10 -6 (A) Ear =9 x 10 ' N x m 2/c2 ( 1.4 x 10 C (0. .06m ) ) Eal =3.5 x 10 6 N/C Ea2 =9 x 10 ' N x m 2/c2 ( -7 .3 x 10 C (0. . 16m) a2 =1.36 x 10' N/C EnetA = Eal + Eaz Eneta= (3.5 x 10 6 N/C) - (1.36 x 10 6 N/C) Eneta =2.14 x 10 N/C (B)