Discussion
Assertion (A): A small transmitting loop must be retuned after a small change of operating frequency.
Reason (R): Its high quality factor gives it a bandwidth of only a few kilohertz.
Select the correct answer from the options below.
Answer: A
Both are true and the second is the reason. The same property that makes an efficient small loop possible, a very low loss resonant circuit, necessarily gives it a narrow bandwidth, since bandwidth is the resonant frequency divided by the quality factor. It is the Chu limit appearing in a practical form: a small antenna may be efficient or broadband but not both. Remote tuning is the engineering answer rather than any escape at all from the underlying physics.
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