A potential k q1/r12 exists at point Pdue to charge q1. The potential energy of the pair of charges is given by k,q192/*12: 12 91 91 Р Figure 24.8 (a) Charge q, estab- lishes an electric potential V, at point P. (b) Charge q, is brought from infinity to point P. 91 V = k, '12 92 b
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Water constitutes about 70% of earth. Some important distinguishing properties of water are high molar concentration, small dissociation constant and high dielectric constant.
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An electrostatic force is a force caused by stationary electric charges /fields. The electrostatic force is caused by the transfer of electrons in conducting materials. Coulomb’s law determines the amount of force between two stationary, charged particles. The electric force is the force which acts between two stationary charges. It is also called Coulomb force.
As shown in 24.8b, take q2 to be a negative source charge and q1 to be a second charge whose sign can be changed. (i) If q1 is initially positive and is changed to a charge of the same magnitude but negative, what happens to the potential at the position of q1 due to q2? (a) It increases. (b) It decreases. (c) It remains the same. (ii) When q1 is changed from positive to negative, what happens to the potential energy of the two-charge system? Choose from the same possibilities.
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