Review Conceptual Example 7 as background for this problem. A positive charge +9₁ is located to the left of a negative charge -92. On a line passing though the two charges, there are two places where the total potential is zero. The first place is between the charges and is 4.55 cm to the left of the negative charge. The second place is 8.50 cm to the right of the negative charge. (a) What is the distance between the charges? (b) Find 91/92, the ratio of the magnitudes of the charges. V=OV d 92 V=OV

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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.