In a circuit containing an inductance of zero resistance, the current leads the applied a.c. voltage by a phase angle at

Options

A. `90^(@)`
B. `-90^(@)`
C. `0^(@)`
D. `180^(@)`

Answer

B

Explanation

`tan phi = (X_(L) - X_(C))/(R ) = (X_(L) - 0)/(0) = oo implies phi = 90^(@)`
Current lags behind the applied voltage by a phase angle of `90^(@)` or current leads the applied voltage by a phase angle of `- 90^(@)`.