Topic: Electronics Engineering
A coaxial transmission line carrying an RF signal is perfectly matched to the load. Consider the cross-section of the line, at a plane where the instantaneous voltage is at its maximum value. How will the curl of the E-field vary over this cross-section?
- A. Increases from the center to the outer conductor
- B. Decreases from the center to the outer conductor
- C. Zero everywhere
- D. Constant value proportional to the RF voltage
Answer: D. Constant value proportional to the RF voltage
Explanation: In a coaxial cable perfectly matched to the load, the waves form a pure traveling wave. According to Maxwell's equations $\nabla \times E = -\partial B / \partial t$, it is related proportionally to the instantaneous voltage state across the medium.