What is the resistance of a resistor if the potential difference across the resistor is 4.0 v when a current of 10.0 a flows through the resistor?

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.)

what is the question because that is not a question.