Three point-like charges are placed at the corners of an equilateral triangle as shown in the figure. Each side of the triangle has a length of 24.0 cm, and the point (A) is located halfway between q1 and q2 along the side. Find the magnitude of the electric field at point (A). Let q1 = −2.90 μC, q2 = −3.00 μC, and q3= −4.90 μC.

Four point charges have the same magnitude of 3.2 × 10-¹² C and are fixed to the corners of a square that is 6.2 cm on a side. Three of the charges are positive and one is negative. Determine the magnitude of the net electric field that exists at the center of the square.

Review Conceptual Example 11 before attempting to work this problem. Four charges with equal magnitudes of 9.24 x 10-12 Care placed at the corners of a rectangle. The lengths of the sides of the rectangles are 3.23 cm and 6.21 cm. Find the magnitude of the electric field at the center of the rectangle in Figures a and b. (a) Number (b) Number i i 2, E13 E24 E24 44 3 +9 +9 +9 4 +4 Units Units (b) +9

the diagram as shown. The charges of each marble are q₁6.50 μC, 9₂ 1.17 pc, and q3 -1.79 μC. Marble q, is a distance r = 3.00 cm to the left of the marble q₂, while marble q, is a distance r3 - 2.00 cm to the right of the marble q2, as shown. Calculate the magnitude of the electric field a distance = 1.00 cm to the left of the center marble. N/C 4 observation point 92 r₂ = 0m Another marble is placed 1 cm to the left of the middleimarble. If this new marble has a charge of 3.71 µC, calculate magnitude and direction of the force on it. 77. x magnitude