
a.
Find the roots of the characteristic equation that describes the voltage response of the circuit.
a.

Answer to Problem 1P
The roots of the characteristic equation are
Explanation of Solution
Given data:
The values of resistance, inductance, and capacitance of a parallel RLC circuit are given as follows:
Formula used:
Write the expression for roots of characteristic equation for a parallel RLC circuit as follows:
Here,
Write the expression for Neper frequency as follows:
Here,
Write the expression for resonant radian frequency as follows:
Here,
Calculation:
Substitute
Substitute 12.5 H for
Substitute
The roots are determined as follows:
Conclusion:
Thus, the roots of the characteristic equation are
b.
Find whether the response is over-, under-, or critically damped response.
b.

Answer to Problem 1P
The response for the given system is an over-damped response.
Explanation of Solution
Given data:
The value of capacitance is adjusted to give a neper frequency of
Formula used:
Write the expression for over-damped response for a parallel RLC circuit as follows:
Write the expression for under-damped response for a parallel RLC circuit as follows:
Write the expression for critically damped response for a parallel RLC circuit as follows:
Calculation:
From Part (a), the values of
Substitute
The expression is satisfied. Therefore, the response is the over-damped response. As the Equation (4) is satisfied, it is not required to check the Equations (5) and (6).
Conclusion:
Thus, the response for the given system is an over-damped response.
c.
Calculate the value of resistance that yields a damped frequency of
c.

Answer to Problem 1P
The value of resistance that yields a damped frequency of
Explanation of Solution
Given data:
Formula used:
Write the expression for damped frequency for a parallel RLC circuit as follows:
Calculation:
Rearrange the expression in Equation (7) as follows:
Substitute
Rearrange the expression in Equation (2) as follows:
Substitute
Conclusion:
Thus, the value of resistance that yields a damped frequency of
d.
Find the roots of the characteristic equation for the value of resistance obtained in Part (c).
d.

Answer to Problem 1P
The roots of the characteristic equation are
Explanation of Solution
Calculation:
From Part (c), the value of resistance is obtained as
Substitute
Substitute
The roots are determined as follows:
Conclusion:
Thus, the roots of the characteristic equation are
e.
Calculate the value of resistance
e.

Answer to Problem 1P
The value of resistance that makes the voltage response critically damped is
Explanation of Solution
Calculation:
From Equations (2) and (3), substitute
Rearrange the expression for resistance of the capacitor.
Substitute 12.5 H for
Conclusion:
Thus, the value of resistance that makes the voltage response critically damped is
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