Capacitor

A capacitor is connected to a 20 V battery through a resistance of 10$\Omega$. It is found that the potential difference across the capacitor rises to 2 V in 1 $\mu$s. The capacitance of the capacitor is __________ $\mu$F. Given : $\ln \left( {{{10} \over 9}} \right) = 0.105$