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The damping ratio of a series RLC circuit can be expressed as

1. $\frac{R^2C}{2L} \\$
2. $\frac{2L}{R^2C} \\$
3. $\frac{R}{2} \sqrt{\frac{C}{L}} \\$
4. $\frac{2}{R} \sqrt{\frac{L}{C}}$