In a lossless transmission line, which parameters determine the value of the impedance of the line?

The impedance of a lossless transmission line is primarily determined by the inductance per unit length and the capacitance per unit length of the line. In the context of transmission lines, the inductance represents how much magnetic field is created by the currents in the conductors, while the capacitance reflects how the electric fields behave between the conductors.

In a lossless transmission line scenario, it is assumed that there are no resistive losses caused by resistors in the circuit. Therefore, the line's impedance does not factor in resistors. The impedance of a lossless transmission line can be derived from the following formula:

[ Z_0 = \sqrt{\frac{L}{C}} ]

Where ( Z_0 ) is the characteristic impedance, ( L ) is the inductance per unit length, and ( C ) is the capacitance per unit length. This clearly indicates that inductors and capacitors are the key parameters in determining the impedance, specifically in relation to energy storage in the electric and magnetic fields.

The other options included resistors, which do not influence the characteristic impedance of a lossless line since we consider it to be ideal, characterized solely by inductance and capacitance. Thus, the correct choice highlights