The constants R and L of a coil can be obtained by connecting the coil in series with a known resistance and measuring the coil voltage V_x, the resistor voltage V₁, and the total voltage V_T (Fig. 9-22). The frequency must also be known, but the phase angles of the voltages are not known. Given that f = 60 Hz, V₁ = 20 V, V_x = 22.4 V, and V_T = 36.0 V, find R and L.

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