Question

If the diameter of earth is $128\times {10}^2$km then its capacitance will be :

• A. $711\mu F$
• B. $331\mu F$
• C. $211\mu F$
• D. $111\mu F$

Answer 1

Answer: (A)

$711\mu F$

The Capacitance of the earth is ,
$C=4\pi {ϵ}_{0}r=4\pi \times 8.854\times {10}^{-12}\times \frac{128\times {10}^2\times {10}^3}{2}=711.72\times {10}^{-6}F\sim 711\mu F$
Ans:(A)