JAMB - Physics (2002 - No. 44)
At what frequency would a capacitor of 2.5μF used in the radio circuit have a reactance of 250Ω
\(\frac{π}{800}\) Hz
\(\frac{800}{\pi}\) Hz
200π Hz
2000π Hz
Explanation
X\(_c\) = \(\frac{1}{2\pi f c}\)
f = \(\frac{1}{ 2 \pi f C}\) = \(\frac{1}{\pi \times 2 \times 250 \times 2.5 \times 10^{-6}}\)
f = \(\frac{1\times 10^6}{ 1250 \pi}\)
f = \(\frac{800}{π}\)
Comments (0)
