# A water drop with an electric charge of + q has joined with another drop with a charge of -q.

A water drop with an electric charge of + q has joined with another drop with a charge of -q. Determine the charge qо of the formed drop.

Electric charge is a scalar quantity, it is added and subtracted according to algebraic laws as real numbers.

When two drops with charges + q and -q merge, a new drop will receive a charge q₀ equal to the algebraic sum of the charges of two drops.

q₀ = (+ q) + (-q);
q₀ = q – q;
q₀ = 0.

In this case, the law of conservation of charge is fulfilled. The drops are still charged. It’s just that the sum of the positive charges is equal to the sum of the negative ones. Zero charge means that the number of positive charge carriers in the body is equal to the number of negative ones.

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