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If you understand complex numbers then you will see that the imaginary value jXC which depends upon the value of C,capacitance, determines the value of the phase displacement angle.

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You don't need to understand complex numbers to understand this topic. The term you are looking for is 'phase angle', not 'phase difference'. This is defined as the angle by which the load current leads or lags the supply voltage. For a resistive-capactive circuit, the load current leads the supply voltage and, so, the phase angle is leading. The actual angle depends on the values of R and XC (capacitive reactance). Incidentally, the 'displacement angle' is something different again!

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