Question

The LC parallel resonant circuit

• A. has a very high impedance
• B. has a very high current
• C. acts as resistance of very low value
• D. has zero impedance

Answer 1

The correct option is A has a very high impedance

In LC parallel resonant circuit, the impedance is given by

$Z=\frac{\left(X_C\right)\left(X_L\right)}{X_C-X_L}$

In LC parallel resonant circuit, at the resonant frequency we have,

$X_C=X_L$

$\therefore Z=\infty$

Also, For pure resistor, Z = R

Hence,

In LC parallel resonant circuit, the impedance is near to infinity or very high.

Option A is correct.

Since, the impedance(resistance) is maximum, the current is negligible or zero it circulates back and forth between components without involving the source.. Hence, option B, C and D are incorrect.