Which is an example of radiation?

a charge 3q is at the origin, and a charge −2q is on the positive x axis at x=a. part a where on the x-axis would you place a third charge so it would experience no net electric force? enter an expression for the exact answer, which will involve a square-root sign. (do not enter an approximate decimal answer.)

a lot of it means it can be "burned" for energy and sold at one price. if it is scarce, the price will go up