Three charged particles are at the corners of an equilateral triangle as shown in the figure below. (Let q = 4.00 µC, and L = 0.650 m.) 7.00 μC y 9 60.0⁰ L x -4.00 μC (a) Calculate the electric field at the position of charge q due to the 7.00-μC and -4.00-μC charges. kN/C Î + kN/Cĵ (b) Use your answer to part (a) to determine the force on charge q. ImNî + 7mNî

Three charged particles are at the corners of an equilateral triangle as shown in the figure below. (Let q = 3.00 μC, and L 0.750 m.) 7.00 μ. 60.0⁰ 9 -4.00 uc (a) Calculate the electric field at the position of charge q due to the 7.00-μC and -4.00-μC charges. kN/CI+ KN/C J (b) Use your answer to part (a) to determine the force on charge q. mNi+ mNj

The electric field 25.0 cm away from a very long uniform line of charge is 620 N/C. What is the uniform charge density of this very long line? (so = 8.85 x 10-12 c²/Nm², k = 9.00 x 10⁹ Nm²/C²) 4.31 x 10-6 C/m 3.49 x 1011 C/m 8.62 x 10-9 C/m 8.62 x 10-6 C/m 3.49 x 107 C/m 4.31 x 10-9 C/m

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