A parallel LCR circuit with inductance 30mH, capacitance 1μF and resistance 1kΩ is connected to a sinusoidal current source supplying 10A at frequency ‘omega’.

(a)Use complex admittances with symbolic maths to find an expression for the phasor voltage, and ezplot the magnitude of the voltage from omega=100 rad/s to 10000 rad/s. Observe the resonance and check its location. Explain the magnitude of the voltage at resonance. Decrease R and plot again.
What has happened?



(b) Plot the phase angle of the voltage over the same range. Note: since angle does not accept symbols, you can generate an array of voltage values, take the angle, and use plot.

这个问题要怎么解，多谢各位回答一下

A parallel LCR circuit with inductance 30mH, capacitance 1μF and resistance 1kΩ is connected to a sinusoidal current source supplying 10A at frequency ‘omega’.

(a)Use complex admittances with symbolic maths to find an expression for the phasor voltage, and ezplot the magnitude of the voltage from omega=100 rad/s to 10000 rad/s. Observe the resonance and check its location. Explain the magnitude of the voltage at resonance. Decrease R and plot again.
What has happened?



(b) Plot the phase angle of the voltage over the same range. Note: since angle does not accept symbols, you can generate an array of voltage values, take the angle, and use plot.

这个问题要怎么解，多谢各位回答一下