A box P and a coil Q are connected in series with an 10 VAC source of variable frequency. Box P contains a capacitance of 1 μF in series with a resistance of 32 Ω. Coil Q has a self inductance of 4.9 mH and a resistance of 68 Ω in series. The frequency is adjusted so that maximum current flows in P and Q.
(iv) The voltage across coil Q is
[1 Mark]