As \(|u|\) increases, \(v\) decreases for \(|u|>f .\) The graph between \(|v|\) and \(|u|\) is shown in the figure. A straight line passing through the origin and making an angle of \(45^{\circ}\) with the \(\mathrm{x}\) -axis meets the experimental curve at \(P(2 f, 2 f)\)