An isolated sphere has a capacitance of 60 pF. what is the radius of the sphere?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 54 cm
The capacitance of a capacitor is,
$C=4πε_0r$
$⇒r=\frac{C}{4πε_0}=\frac{60×10^{-12}}{4π×8.85×10^{-12}}$
$≃0.538m=53.8cm$