A skeletal equation is also called a/an equation

An unbalanced equation is a chemical equation in which the total number of atoms of each element on the reactant side is not equal to the number of atoms of the same element on the product side. This equation is also called a skeletal equation.

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continuous conducting path for current, power supply

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.