Subelement A: — Topic :
Question 6A109
Element 6 (Radiotelegraph)What is the reactance of a 2-henry choke at 3000 Hz?
Explanation
The reactance of an inductor, known as inductive reactance ($X_L$), is calculated using the formula:
$X_L = 2 \pi f L$
Where:
* $X_L$ is the inductive reactance in ohms
* $\pi$ (pi) is approximately 3.14159
* $f$ is the frequency in Hertz (Hz)
* $L$ is the inductance in Henries (H)
Given values:
* Frequency ($f$) = 3000 Hz
* Inductance ($L$) = 2 Henries
Substitute these values into the formula:
$X_L = 2 \times \pi \times 3000 \text{ Hz} \times 2 \text{ H}$
$X_L \approx 2 \times 3.14159 \times 3000 \times 2$
$X_L \approx 37699.08 \text{ ohms}$
Rounding this value, we get approximately 37,680 ohms. This matches option B. Options A, C, and D are incorrect and likely result from mathematical errors in calculation or misapplication of the formula. Understanding inductive reactance is crucial for designing and analyzing AC circuits involving chokes and coils.
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