In a salt crystal, the distance between adjacent sodium and chloride ions is 2.8×10−10×10−10 m. What is the force of attraction between the two singly charged ions?

Two charged spheres are 5.86 cm apart. They are moved, and the force on each of them is found to have been tripled. How far (in cm) apart are they now?

Two charges one negative and one positive with strength Q1 = -3*q and Q2= +2*q (where q=7.0 nC,q=7.0*10°C) are placed 3.6m apart. Pis located x distance from Q1, and is a point where the sum of the voltage of the two charges will sum to zero. What is the magnitude and direction in x-axis of the electric field at point P due to Q1 and Q2 in units of Newton/Coulomb? +2q 3.6

d- d- + + P +9 -9-9 +9 -p +p Electric quadrupole. The figure shows an electric quadrupole. It consists of two dipoles with dipole moments that are equal in magnitude but opposite in direction. What is the value of E on the axis of the quadrupole for a point P a distance z from its center (assume z >> d)? Take Q = 2qd² (which is known as the quadrupole moment of the charge distribution.) NOTE: Express your answer in terms of Q and z, using ε0 when needed. E =

In the figure two tiny conducting balls of identical mass m and identical charge q hang from nonconducting threads of length L. Assume that is so small that tan 0 can be replaced by its approximate equal, sin 8. If L = 140 cm, m = 10 g, and x = 6.0 cm, what is the magnitude of q? L ᏀᎾ Ꮎ Number i L 9 0.0000009165 Units nC

Two small balls, each of mass 3.0 g, are attached to silk threads 30 cm long, which are in turn tied to the same point on the ceiling, as shown in the figure. When the balls are given the same charge Q, the threads hang at 0 = 3.0° to the vertical. What is the magnitude of Q?

An infinitely long line of charge has linear charge density 5 x 10-12 C/m. A proton is at distance 13 cm from the line and moving directly toward the line at speed 0.5 × 103 m/s. How close (in cm) does the proton get to the line of charge?

Two chloride ions and two sodium ions are in water, the “effective charge” on the chloride ions (Cl−) is −2.00 × 10−21 C and that of the sodium ions (Na+) is +2.00 × 10−21 C. (The effective charge is a way to account for the partial shielding due to nearby water molecules.) Assume that all four ions are coplanar.             where a = 0.280 nm, b = 0.760 nm, and c = 0.460 nm.         What is the direction of electric force on the chloride ion in the lower right-hand corner in the diagram? Enter the angle in degrees where positive indicates above the negative x-axis and negative indicates below the positive x-axis.   °         Prev