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The impedances $Z=jX,$ for all $X$ in the range $\left ( -\infty ,\infty \right )$, map to the Smith chart as

1. a circle of radius $1$ with centre at $(0, 0)$.
2. a point at the centre of the chart.
3. a line passing through the centre of the chart.
4. a circle of radius $0.5$ with centre at $(0.5, 0)$.