An LCR series ac circuit is at resonance with 10 V each across L, Cand R. If the resistance is halved, the respective voltages across L, C and R are: (a) 10 V, 10 V and 5 V (b) 10 V, 10 V and 10 V (c) 20 V, 20 V and 5 V (d) 20 V, 20 V and 10 V

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