Discussion
What current distribution is normally assumed along a thin dipole?
Answer: D
The standard thin wire approximation takes a sinusoidal standing wave of current that must vanish at the open ends, since no current can flow into free space there. For a half wave dipole this puts the maximum at the centre, which is why centre feeding gives a convenient impedance. A uniform distribution belongs to the idealised Hertzian element, and the other two shapes describe no physical wire antenna. The assumption is remarkably accurate for thin conductors.
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