Question

1. Three charges are fixed in the x?y plane as follows: 1.7nC at the origin (0, 0); 2.6nC at (0.75m , 0);

Answer 1

1) The 2.3 nC charge creates s force in the -x direction and the othe rcreates a force in the +y direction

So Fx = -k*q1*q2/r^2 = -9.0x10^9*1.7x10^-9*2.6x10^-9/0.75^2 = -7.072x10^-8 N

and Fy = k*q1*q2/r^2 = 9.0x10^9*1.7x10^-9*1.9x10^-9/1.25^2 =1.859x10^-8 N

So F = sqrt(Fx^2 + Fy^2) = sqrt((7.072x10^-8)^2 +(1.859x10^-8)^2) = 7.3122x10^-8N and

the angle it makes with the x axis is arctan(Fy/Fx) = arctan(1.859/-7.072) = -14,72oC but since Fx is negative the angle = -14.72 + 180 = 165.28oC