Three point charges, two positive and one negative, each having a magnitude of 22 µC are placed at the vertices of an equilateral triangle (32 cm on a side). +q -90 +q Ka What is the magnitude of the electro- static force on one of the positive charges? The value of the Coulomb constant is 8.98755 × 10⁹ N· m²/C². X Answer in units of N. Answer in units of N

Two identical positive charges exert a repulsive force of 6.6 × 10−9 N when separated by a distance 3.9 × 10−10 m. Calculate the charge of each. The Coulomb constant is 8.98755 × 109 N · m2 /C2 . Answer in units of C. Answer in units of C.

Four point charges are held fixed in space on the corners of a rectangle with a length of 20 [cm] (in the horizontal direction) and a width of 10 [cm] (in the vertical direction). Starting with the top left corner and going clockwise, the charges are q1=+10 [nC] , q2=−10[nC] , q3=−5[nC] , and q4=+8[nC] .a) Find the magnitude and direction of the electric force on charge q4b) Find the magnitude and direction of the electric field at the midpoint between q3and q4c) Find the magnitude and direction of the electric field at the center of the rectangle.

In the figure four particles form a square with edge length a = 3.02 × 10-2 m. The charges are q₁ = 94 = 2.37 × 10-15 ℃ and 92 = 93 = q. (a) What is q if the net electrostatic force on particle 1 is zero? (b) Is there any value of q that makes the net electrostatic force on each of the four particles zero? a a