A point charge q₁ = 115.8 nC is at the origin of an xy-coordinate system, a point charge q2 = -148.4 nC is on the x-axis at x = 2.13 m, and a point charge q3 = -55.8 nC is on the y-axis at y = 1.23 m. (Include a minus sign if necessary.) a) Determine the magnitude of the net force on 9₁. N b) Determine the angle relative to the positive x-axis (in degrees) of the net force on 9₁.

Consider the following. 60.0⁰ B 0.500 mm (a) Red blood cells often become charged and can be treated as point charges. Healthy red blood cells are negatively charged, but unhealthy cells (due to the presence of a bacteria, for example) can become positively charged. In the figure, three red blood cells are oriented such that they are located on the corners of an equilateral triangle. The red blood cell charges are A = 1.80 pC, B = 7.10 pC, and C= -4.30 pC. Given these charges, what would the magnitude and direction of the electric field be at cell A? (1 pC = 1 x 10-12 C.) magnitude N/C direction o counterclockwise from the +x-axis (b) If the charge of cell A were doubled, how would the electric field at cell A change? O The field would be unchanged. O The magnitude of the field would be doubled. O The magnitude of the field would be quadrupled. O The magnitude of the field would be halved.

Q. 1 Two-point charges q1(3.0µC) and q2(6.0µC) are placed a distance d apart in vacuum. Calculate the Coulomb force experienced by charge q2 due to charge qi for d = 40.0cm, 60.0cm, 80.0cm, 1.00m and 1.2m. Plot the force as a function of d. 20.0cm, q1 q2 d.