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In a AC circuit containing capacitance only

Q. In a AC circuit containing capacitance only

 A   current lags the emf by π/2
 B   current leads the emf by π/2
 C   current leads the emf by π
 D   current lags the emf by π
Answer:-current lags the emf by π/2

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Crystals having low melting points are in

Substances which lose their electrical resistance at very low temperature are called