-1 μC For the following arrangement of point charges, what is the work that an external has to do to bring them from an infinite separation to their current position?

Two point charges, A & B (qR = 123 µC), are separated by 86 cm. The distance between A & P is 20 cm. The potential at point P (see below) is zero. Determine qa. A 9A = 20 сm 86 cm WebAssign Plot

103 In Fig. 24-72, two particles of charges qi and q2 are fixed to an x axis. If a third particle, of charge +6.0 µC, is brought from an infinite distance to point P, the three-parti- cle system has the same electric potential energy as the original two-particle system. What is the charge ratio qılq2? |-d--1.5d-| Figure 24-72 Problem 103.

In a magnesium oxide unit, the distance between the magnesium ion (Mg2+) and the oxide ion (O2−) is 1.51×10-10 m. Calculate the work required to separate the two ions to an infinite distance apart. (Model the ions as point charges at rest before and after the separation.)

A water molecule is built as an isosceles triangle; the two hydrogen atoms are separated by 1.5x10-10m, and the oxygen is a distance 1x10-10m from either of the hydrogens. Treating the hydrogens as point charges, each of +e, and the oxygen as a point charge of -2e, estimate the total electric potential energy stored in this molecule.

The figure below shows two point charges q1 = +5.4 10-8 C and q2 = -5.9 10-8 C.   (a) Find the potential at A.(b) Find the potential at B.(c) Find the potential difference VA − VB.