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A backward wave means
Negative voltage wave
Negative current wave
wave traveling in the negative direction
wave traveling in the positive direction
wave traveling in the negative direction
Quick Trick: Remember the word 'backward' directly maps to the negative direction of wave propagation along the transmission line coordinate.
Remember the word 'backward' directly maps to the negative direction of wave propagation along the transmission line coordinate.
Define Wave Propagation
In transmission line theory, the general solution for a wave is a function of (x - vt) for forward waves and (x + vt) for backward waves.
Identify Directional Context
A wave traveling in the positive x-direction is called a forward wave, while a wave moving toward the source (opposite to the positive reference) is termed a backward wave.
A: Negative voltage relates to polarity, not propagation direction. B: Negative current relates to phase or direction of flow, not the wave propagation vector. D: A wave traveling in the positive direction is defined as a forward wave.
C is correct because by definition in electromagnetic wave theory, a backward wave is one that propagates in the direction opposite to the established positive reference axis (negative direction).
Always distinguish between wave polarity (positive/negative voltage/current) and propagation direction (forward/backward) to avoid traps in power system transient questions.