1. Three charged particles, on a Figure on the right, are at the corners of an 700 μC equilateral triangle. Determine the net electrostatic force at 0.500 m 60.0° the centre of a triangle due to all three 2.00 µC -400 μC charges.

In the figure three charged particles lie on an x axis. Particles 1 and 2 are fixed in place. Particle 3 is free to move, but the net electrostatic force on it from particles 1 and 2 happens to be zero. If L23 = L12, what is the ratio q1/q2? L23 '12 3 1

a 3 In the figure, the particles have charges q1 = -92 800 nC and 93 = -94 = 90.4 nC, and distance a = 7.25 cm. What are the (a) x and (b) y components of the net electrostatic force on particle 3? (a) Number i 0.03353 (b) Number i -0.07132 Units 'Units ST N N

magnitude direction BµC 60.0⁰ A μC No 0.500 m i (a) Three point charges, A = 1.70 μC, B = 7.25 μC, and C = -4.60 µC, are located at the corners of an equilateral triangle as in the figure above. Find the magnitude and direction of the electric field at the position of the 1.70 μC charge. N/C ° below the +x-axis Cuc (b) How would the electric field at that point be affected if the charge there were doubled? The magnitude of the field would be halved. The field would be unchanged. The magnitude of the field would double. The magnitude of the field would quadruple. Would the magnitude of the electric force be affected? OYes

1. Figure below shows an arrangement of four charged particles with 0 = 30.0°and the distance d= 2.00 cm. Particle 2 has charge q2 =+ 8.00x10 -19C; particle 3 and 4 have charges q3=q4=- 1.60 x 10 -19 C. y (a) What is distance D between the origin and particle 2 if the net electrostatic force on particle 1 due to the other particles is zero? (b) If particles 3 and 4 were moved closer to the x axis but maintained their symmetry about that axis, would the required value of D be greater than, less than, or same as part (a)? d D 2 1 4

In the figure four particles are fixed along an x axis, separated by distances d = 4.00 cm. The charges are q1 = +4e, q2 = -e, q3 = +e, and 94 = +12e, with e = 1.60 × 10-19 C. VWhat is the value of the net electrostatic force on (a) particle 1 and (b) particle 2 due to the other %3D particles? d d d 1 3 4 (a) Number Units (b) Number i Units