A cylindrical capacitor has two co-axial cylinders of length $20 \,cm$ and radii $2 r$ and $r$. Inner cylinder is given a charge $10 \,\mu C$ and outer cylinder a charge of $-10 \,\mu C$. The potential difference between the two cylinders will be
A cylindrical capacitor has two co-axial cylinders of length $20 \,cm$ and radii $2 r$ and $r$. Inner cylinder is given a charge $10 \,\mu C$ and outer cylinder a charge of $-10 \,\mu C$. The potential difference between the two cylinders will be
- A
$\frac{0.1 \ln 2}{4 \pi \varepsilon_0} mV$
- B
$\frac{\ln 2}{4 \pi \varepsilon_0} mV$
- C
$\frac{10 \ln 2}{4 \pi \varepsilon_0} mV$
- D
$\frac{0.01 \ln 2}{4 \pi \varepsilon_0} m V$
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